Alleles that are even strongly deleterious late in life experience only weak selection pressure even if there is no drop in fecundity after reproductive age is reached. This is because:
A. By the time the allele acts, most individuals in a population with the allele have already reproduced.
B. The allele occurs in low frequency late in life.
C. Both answers (labelled A -- and B-- ) are correct
D. Neither answer (labelled A-- or B--) is correct
Answers
Alleles that exhibit strong deleterious effects late in life tend to experience weak selection pressure, even in the absence of a decline in reproductive capacity after reaching reproductive age. This is primarily because most individuals in a population with the allele have already reproduced before the detrimental effects manifest. Therefore, option A is indeed the correct answer.
To elaborate, alleles that confer negative effects later in life do not impose significant constraints on an individual's ability to reproduce and pass on their genes during their reproductive years. Since the majority of individuals carrying the allele have already completed their reproductive responsibilities, the allele persists in the population despite its detrimental consequences. As a result, the selective pressure exerted on these alleles is relatively weak since the allele's presence does not have a substantial impact on the overall fitness of the population.
In contrast, option B, which suggests a low frequency of the allele late in life, does not directly address the selection pressure experienced by the allele. The focus is not on the frequency of the allele, but rather on the absence of strong selective forces acting against it due to the timing of its negative effects in relation to reproductive age.
In summary, alleles that exhibit pronounced negative effects later in life encounter weak selection pressure since they do not significantly affect an individual's reproductive success. As a result, these alleles can persist in the population, even if they lead to detrimental consequences in old age. Therefore, option A correctly explains the dynamics of selection pressure on such alleles.
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Related Questions
Explain process of small scale cultivation of mushrooms
Answers
Answer:
Preface
The second edition of Six Steps to Mushroom Farming recognizes that much progress in mushroom farming has taken place over the last 25 years since the original edition was published. Trends such as use of forced aeration Phase I, Phase II tunnels, Phase III bulk spawn run, casing inoculum, compost supplementation, hybrids, improved nutritional status of mushrooms, and alternative uses of post-crop mushroom compost necessitates an updated, reorganized, and expanded second edition of Six Steps to Mushroom Farming.
Mushroom farming consists of six steps, and although the divisions are somewhat arbitrary, these steps identify what is needed to form a production system. The six steps are Phase I composting, Phase II composting, spawning, casing, pinning, and cropping. These steps are described in their naturally occurring sequence, emphasizing the salient features within each step. Compost provides nutrients needed for mushrooms to grow
Explanation:
https://extension.psu.edu/six-steps-to-mushroom-farming
The process of small-scale cultivation of mushrooms is Mushroom Spawn, getting ready for compost, and harvest.
What is mushroom cultivation?Mushroom cultivation is a process utilizing waste substances inclusive of horse manure, bird manure, pig manure, wheat straw, rice straw, corn cobs, wooden bark, sawdust, and cottonseed hulls to produce scrumptious and nutritious meals.
The cultivation method has 5 principal steps.
Mushroom Spawn.getting ready for compost.Spawning of mulch.Casing.Cropping and harvest administration.Learn more about mushroom cultivation here:-https://brainly.com/question/26093768
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The biological selection of a particular allele for a trait to be passed to offspring has nothing do with the selection of the allele for another trait. Which of the following supports this statement?
Answers
Answer:
1
Explanation:
Which lists three living units of the human body in order from the simplest to the most complex level of organization?
A. red blood cell → circulatory system → blood
B. nervous system → nerves → brain
C. red blood cell → heart tissue → circulatory system
D. bone tissue → skeletal system → bone
Answers
Answer:
C
Explanation:
Cell to tissue to organ to organ system to organism
Answer:
The correct answer is
(B.) nervous system → nerves → brain
Explanation:
The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
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Directions: Identify the kind of relationship shown in the following
Learning Task No.1DO YOU KNOW ME? help pls
Answers
Answer:
Food chains?
Explanation:
Predator and preys
Answer:
1. Predation 2. Parasitic 3. Competition 4. Symbiosis 5. Mutualism
Explanation:
Predation- Predator hunting prey Ex: lions hunting gazelle
Parasitic- One organism benefits while the other is harmed Ex: Lice eating Hair
Competition- Organisms fighting over reasources Ex: Hippos fighting for space
Symbiosis- Two unalike organisms form a bond where they both benefit Ex: Birds eating ticks off buffalo.
Mutualism- Two organisms benefit from each other Ex: whale shark getting cleaned by remora fish which get a meal.
Jolene's friends are using weight-loss supplements to lose a lot of weight in a short amount of time. Jolene didn't think it was a safe idea but her friends continued to encourage her to try them, and she is having trouble standing her ground. What can Jolene say to help her handle this difficult situation?
Answers
Explanation:
Jolene should give her pros and cons about the weight loss supplements she should do more research so that whenever she's going to talk to her friends she has facts on her hand
Answer:
"I am worried that those supplements might be unhealthy, and I am uncomfortable with you pressuring me to try them."
Explanation:
took the quiz and got it right :)
hope I helped ~~~
4. In horses, black color (B) is dominant over chestnut color (b). In a Punnett
square, show the cross between two hybrid black horses.
B
Answers
Answer:
The cross between two hybrid black horses would produce three black and one chestnut horse, shown in a Punnett square as required.
Explanation:
According to the question, the coat color in horses follows Mendelian inheritance, where the gene for black coat color (denoted by B) is dominant over the gene for chestnut coat color (denoted by b). Thus, for a horse to have a black coat color, either of the two genotypes may be possible : (i) BB and (ii) Bb.Bb is termed heterozygous or may be referred to as hybrid black. However, to have a chestnut coat color, the horse must have the genotype bb.How to make a Punnett square to determine the cross between two hybrid black horses?
To make the Punnett square, we must know the gametes produced by the two parent individuals. Here, both parents are hybrid black (Bb). So each of the two parents will produce two types of gametes --- one bearing the gene for black coat color (B) and the other bearing the gene for chestnut coat color (b).These gametes are then placed in a Punnett square and all possible gamete combinations are obtained. Here, since two gametes from each parent are involved, so the number of possible combinations = 2² = 4. These combinations are : BB ---- True black/ homozygous black Bb ---- Hybrid black/ Heterozygous blackBb --- Hybrid black/ Heterozygous blackbb ---- chestnut Therefore, phenotypic ratio = Black : Chestnut = 3 : 1And genotypic ratio = BB : Bb : bb = 1 : 2 : 1.
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If all of our senses ultimately send the same kind of electrical signals to the brain, how do we end up with our distinct sensory and perceptual experiences?.
Answers
Since the senses are received by different parts of the brain according to the situation of the body, that is why we have distinct sensory and perceptual experiences.
Senses are the ability of the body to feel the changes or happenings around their body. This action is mediated by the different organs and regulated by the brain.
Brain is the center for the regulation of all the activities of the body. It resides inside the skull where it is protected from injuries. The brain is divided into left and right hemispheres and has three parts: the forebrain, the midbrain and the hindbrain. Different parts of the brain regulate different actions of the body.
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Which conclusion can be supported by the fact that explorers introduced dogs and horses in Florida?
Horses were among the first domesticated animals in the world.
Dogs and horses were an essential component of Florida’s economy.
Livestock trade originated in Florida and moved westward.
Exploration led to the introduction of new livestock to America.
Answers
Answer:
exploration led to the introduction of new livestock to America
Explanation:
in the question, it says that explores introduced dogs and horses in Florida. That means that there weren't any dogs or horses there before the explorers.
Why is the ventricle of the frogs heart thicker and more muscular than the Atria
Answers
Answer: The thick muscular wall of the left ventricle ensures that it develops a higher pressure during contraction in order to force blood through the body
While each of these processes are believed to have evolved prior to aerobic respiration, which one is the most critical process, without which aerobic respiration could never have developed?
Answers
Answer:
The most critical process, without which aerobic respiration could never have developed, is the process of photosynthesis. Photosynthesis is the biological process by which plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a form of energy-rich sugar) and oxygen. This process is responsible for producing the oxygen present in the atmosphere and is the primary source of organic carbon compounds for most life forms on Earth.
Aerobic respiration, on the other hand, is the process by which living organisms use oxygen to convert glucose and other organic molecules into energy, carbon dioxide, and water. It is an essential metabolic process that enables the efficient release of energy from organic compounds.
Photosynthesis provided the evolutionary basis for the development of aerobic respiration. The oxygen generated as a byproduct of photosynthesis in early photosynthetic organisms accumulated in the atmosphere over billions of years, leading to the establishment of an oxygen-rich environment. This increase in atmospheric oxygen levels eventually paved the way for the evolution of aerobic respiration, as organisms could utilize oxygen as an electron acceptor to extract energy from organic molecules more efficiently.
Therefore, while other processes might have evolved prior to aerobic respiration, photosynthesis played a crucial role in creating the conditions necessary for the development of aerobic respiration, making it the most critical process in this context.
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Tyler and his family drove from Atlanta to Baltimore. They traveled a total of 678 miles over 2 days.
What is the reference point in this scenario?
a. Atlanta
b. Baltimore
c. 678 miles
d. 2 days
Answers
Answer:
atlanta i think
Explanation:
In this case the reference point is Atlanta, this is where the family started their motion from. Such that this point may be used to describe their movement. It is sued to describe their movement to Baltimore.
Answer:
I believe the answer is A Atlanta
Explanation:
What will probably happen to the book if it is left in "position 1" for an extended period of
time? Why?
Answers
Time period (plural time periods) The length of time during which an activity occurs or a condition remains. It may be measured either in seconds or in millions of years, depending upon the nature of the activity of condition being considered.
How do you calculate time period of motion?The equation for the period of the motion is given by the angular frequency: = 2 / T, = 2 / T. T = 2 π m k The time period is the least amount of time required to complete one oscillation, or it can alternatively be described as the minimum amount of time after which the particle continues to repeat its motion.
T = 2π/ω Women often shed 20 to 90ml (or 1 to 5 tablespoons) of blood during their menstruation, which lasts between 2 and 7 days. Although some women bleed more heavily than this, if having heavy periods is a problem, assistance is available.
Learn about the busy times. The frequency is the number of times a cycle is finished in a second. the duration of the project.
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Explain the functions of the prefrontal cortex and their relationship to impulse control.
Answers
Answer:
The prefrontal cortex helps with Impulse control and learning to managing emotional reactions. The functions of prefrontal thoughts, whats good or bad, controlling of urges.
Explanation:
Answer:
i agree with Coilsandfries
Explanation:
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What are the responsibilities of the region of the brain highlighted below?
Controlling voluntary body movements, processing information from sense organs, thoughts, and learning abilities
Regulating important involuntary bodily functions such as blood pressure, heart rate, breathing, and swallowing
Regulating the body’s homeostasis, hunger and eating, thirst and drinking, and other functions of basic survival
Coordinating movement and balance by using information from sensory nerves, including hand-eye coordination
Answers
Answer:
good keep it up i guss it is your own creation so i like it
If a carbon atom is bonded to two hydrogen atoms and two carbon atoms, what type of bond must exist between the
carbon atoms?
O single
O double
O triple
O quadruple
Answers
the answer is A. single .
What is Transcription, Translation, IN YOUR OWN WORDS
Answers
Answer:
Transcription is the process of making an RNA copy of a gene sequence. This copy, called a messenger RNA (mRNA) molecule, leaves the cell nucleus and enters the cytoplasm, where it directs the synthesis of the protein, which it encodes.
Explanation:
Which structure includes all of the others?
O nucleus
O cell
O ribosomes
O mitochondria
B4O HRELP ME IM A FRESHMAN DUDE PLS
Answers
Answer:
Cell
Explanation:
Hi there!
A cell is the smallest unit of a living thing. However, a cell, much like a person, must have other parts inside of it in order to function (it can't function by itself).
The nucleus, ribosomes, and mitochondria are all structures inside of a cell; they are some of the organelles inside of a cell, which help the cell do specific jobs, a bit like how a machine needs special pieces in order to do certain tasks.
Therefore, a cell is the structure that includes all of the others, since the other structures are organelles that help the cell function, and they are all inside of the cell.
Hope this helps!
In a scientific experiment the ____ Group is The data that comes from the norm or situation. it is the information the other group compared to
Answers
The reason why is because the experimental group is the group in which they are experimenting with while the control group isn’t receiving any experimentation
help.....................plz
Answers
ukinnam kanyam daytan hahah
Can someone help me list the following events?
Answers
Answer:
Explanation:
A: Rocky crust
B: Mohorovicic
C: outer mantel
D: inner mantel
E: Gutenbem
F :outer core
G :inner core
the articulation between a rib and the sternum is classified anatomically as a cartilaginous joint and functionally as an amphiarthrosis. what do these classifications mean?
Answers
Anatomical Classification: This classification identifies the type of connective tissue between the bones of the joint and, to a lesser extent, the types of movement that occur at the joint. Functional Classification : This classification identifies the type and amount of movement that occurs at a joint.
These classifications mean the following:
Anatomical Classification: This classification identifies the type of connective tissue between the bones of the joint and, to a lesser extent, the types of movement that occur at the joint. The rib and the sternum articulate through a cartilaginous joint which is a joint that's made of cartilage tissue. It is a joint between bones that do not connect directly to one another but are held together by a pad of cartilage.
Functional Classification : This classification identifies the type and amount of movement that occurs at a joint. Amphiarthrosis is a functional classification that describes a joint that has limited movement. This means that the joint allows some movement, but not as much as a freely movable synovial joint. The articulation between a rib and the sternum allows for slight movements such as expansion and contraction during breathing, but it is limited and is important to maintain the stability of the ribcage.
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Because the 17 and the 13 Cicada have different breeding seasons and experience temporal isolation, what will probably never happen between the different species?
Answers
Answer:
Mutations in the gene pool
Explanation:
how does human activity cause disruptions in the ecosystem?
Answers
Answer:
Human impact on the environment or anthropogenic impact on the environment includes changes to biophysical environments and to ecosystems, biodiversity, and natural resources caused directly or indirectly by humans, including global warming, environmental degradation (such as ocean acidification), mass extinction and etc...
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
14. The instructions for assembling proteins are contained in the
A. genes.
B. ribosomes.
C. exons.
D. introns.
Answers
The instructions for assembling proteins are contained in the genes. Therefore, the correct option is option A.
The fundamental macromolecules known as proteins are crucial for many biological functions. They are made up of lengthy chains of amino acids connected by peptide bonds. Every cell and tissue in the body contains proteins, which play a variety of roles in the body, including creating structure, facilitating movement, facilitating communication, and catalysing chemical reactions. The construction and maintenance of cells' and tissues' structural integrity is one of proteins' most important jobs. Connective tissues, skin, hair, and nails are supported and given strength by structural proteins like collagen and keratin.
Therefore, the correct option is option A.
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Are there more genetic variations among offspring after having the event of crossing over? Yes or No?
Answers
Answer:
yes
Explanation:
what is the mRNA of GAGATTTACCGTAGC
Answers
Answer:
CUCUAAAUGGCAUCG
Leu-Ter-Met-Ala-Ser
Explanation:
this should be correct, in mRNA A codes for U, T codes for A, C codes for G and G codes for C. Hope this helps
10. Why are most species that have ever lived on Earth extinct?
Answers
Explanation:
At least 571 species have been lost since 1750, but likely many more. The main cause of the extinctions is the destruction of natural habitats by human activities, such as cutting down forests and converting land into fields for farming.
Answer:
Some animals have gone extinct due to over hunting on them for skin, while some have died of because they weren't able to adapt to their environment because it change over time, causing them to go extinct
Explanation:
Alleles for the A and B blood cell antigens are codominant. The condition
where no antigens are present on the blood cells (type O blood) is a
recessive trait. Which set of parents can most likely produce a child with
type O blood?
Blood Type
Gone
Can Race
Blood From
A
А
AA
AD
A or o
AM
B
30
BO
Boro
AB
AB
A,B,
AB, O
o
8
00
o
HELPPPP
Answers
Answer:
can you be more specific
from+middle+adulthood+onward,+women+lose+about+__________+of+their+bone+mass.+10%+30%+50%+70%
Answers
From middle adulthood onward, women typically lose about 30% of their bone mass.
From middle adulthood onward, both men and women experience a gradual loss of bone mass. This process is known as osteoporosis. However, it is important to note that women tend to be at a higher risk for osteoporosis due to hormonal changes that occur during menopause.
On average, women can lose about 10% to 30% of their bone mass during their lifetime. It is a gradual process that occurs over several years. The exact percentage of bone loss can vary depending on various factors, including genetics, lifestyle, diet, and overall health.
It's important for women to maintain a healthy lifestyle, including regular exercise, a balanced diet rich in calcium and vitamin D, and avoidance of smoking and excessive alcohol consumption. These measures can help minimize bone loss and reduce the risk of osteoporosis-related fractures. It is also recommended to consult with a healthcare professional for personalized advice and appropriate screenings related to bone health.
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What is the United Nations Millennium Development Goals’ target rate of child survival for the year 2015?
95%
90%
92%
93%
Answers
Explanation:
90%
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