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Concept explainers
To analyze:
What is expected to happen to a trait that increases an individual’s reproductive success relative to that of other individuals?
Introduction:
Evolution is a process by which an organism gets better adapted to the changed environment as the nature supports survival of the fittest. Hence it is always a race among the organisms that are able to increase their reproductive capacity.
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Explanation of Solution
If a trait is intended to increase the reproductive success of an individual, the allelic frequency of that trait will increase while diminishing the frequency of other individual as evolution is the change in allelic frequency in order to support the survival of the fittest.
Hence, it may be concluded that, if a trait increases the reproductive success of an individual, the allelic frequency of that trait increases.
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Chapter 9 Solutions
Loose-leaf Version for What is Life? A Guide to Biology 3e & LaunchPad for Phelan's What is Life? (Six Month Access) 3e
- Please discuss the fitness advantage associated with aiding a related or even an unrelated individual with producing offspring. Please give examples.arrow_forwardIf self-fertilization causes lower fitness than cross-fertilization, under what environmental conditions would self-fertilization be the superior strategy?arrow_forwardThe following statements describe events in the life cycle of a rabbit. Which of these events describes a trait of the rabbit that is most likely passed on to future generations? O A young rabbit develops a bacterial infection and lives long enough to produce three litters. O A young rabbit constantly outruns predators and lives long enough to produce three litters. O A young rabbit survives freezing winter temperatures and digs a burrow in the spring. O A young rabbit migrates to find a better food supply and establishes a new territory.arrow_forward
- what is the relationship between genes and traits expressed in individuals? a) gene code for DNA, which is primarily responsible for individual traits b) Gene code for proteins, which are primarily responsible for individual traits c) genes code for chromosomes, which are primarily responsible for individual traits d) gene codes for carbohydrates, which are primarily responsible for individual traitsarrow_forwardPlease read the scenario below and answer the question (in bold) that follows: In humans, the ability to roll one's tongue is a dominant trait (T). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue though their son, Michael, cannot. If Nia were to (one day) marry a man who was heterozygous for the tongue-rolling trait, what percentage of their children would be able to roll their tongues? a. 0% b. 25% c. 50% d. 75% e. 100% Marrow_forwardHow would you distinguish a trait caused by a sex-linked recessive allele from one caused by a sex-influenced gene that is dominantarrow_forward
- Choose a trait from the list above and describe if you are dominant or recessive for that trait. Do the same for your parents, alternatively, if you have children you can do this with your and your partner's traits and your child(ren), or you can choose a set of parents and children that you know as examples for this exercise. In your response be sure to list how both parents and their child(ren) are expressing the trait, what the potential GENOTYPES are for each individual. What are the possibilities for the parental pair based on their possible genotypes (hint: Punnet Square).arrow_forwardIn some animal species, being tall is dominant over being short. If a homozygous dominant individual mates with a short individual, what is the chance that their offspring will be heterozygous?arrow_forwardIn people, the trait for colorblindness (Xb) is a recessive sex linked trait and normal vision (XB) is dominant. If a female who is heterozygous for colorblindness has children with a man who has normal vision, what percent of their male children would be expected to be color blind? 0% 50% 100% 25%arrow_forward
- The majority of traits are what? (gene number)arrow_forwardDo males and females show equal chances of inheriting the trait? Why or why notarrow_forwardWhat are some ethical concerns associated with encouraging the birth of people with "desirable" traits and discouraging the birth of those with undesirable traits?arrow_forward
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