Sexual selection occurs whena. one sex has a higher fitness than the otherb. a species exhibits sexual dimorphismc. there is a male dominance hierarchy and only the alpha male reproduces. d. There is monogamous mating.e. A trait is favored by one sex such that individuals of the opposite sexpossessing that trait have an increased likelihood of reproducing.

Sexual selection is the way by which organisms of opposite sexes preferably select their mating…

Answered: Sexual selection occurs when

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Sexual selection occurs when

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

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ISBN:9781305967359

Author:STARR

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Chapter17: Processes Of Evolution

Section: Chapter Questions

Problem 4SA

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Concept explainers

Sexual Motivation

Sexual motivation refers to a person's overall desire for sexual activity. It is an unusual motivation. Generally, among lower animals, the term 'drive' is commonly referred to as sexual motivation. It means a certain internal force drags the animal to be involved in reproductive behavior. On the contrary, humans are not simply driven by any internal force; rather, the sexual motivation in humans is due to several factors such as biological (hormones, genes), environmental (familial upbringing, chemical exposure) and physiological factors (culture, desire) which further determine engagement in sexual activities.

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Sexual selection occurs when
a. one sex has a higher fitness than the other
b. a species exhibits sexual dimorphism
c. there is a male dominance hierarchy and only the alpha male reproduces. d. There is monogamous mating.
e. A trait is favored by one sex such that individuals of the opposite sex

possessing that trait have an increased likelihood of reproducing.

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Explain how sexual selection might lead to a)sexual dimorphism and b) members of one sex (usually male) having traits that do not enhance their survival
Alternatively, selection may be performed during mating, where mating is done after a selection process of one of the sexes. The surviving individuals can pass on their (1) to the next generation. When these variations are sustained over a long time and the population changes so that it can no longer (2) with the parent population, a new species is said to have evolved.
How does sexual selection differ from natural selection? a. It does not require heritable traits. b. It determines which individuals get to mate. c. Variation is not required. d. It only involves males.
Which of the following is not required for a behavioral trait toevolve by natural selection?(A) In each individual, the form of the behavior is determinedentirely by genes.(B) The behavior varies among individuals.(C) An individual’s reproductive success depends in part onhow the behavior is performed.(D) Some component of the behavior is genetically inherited.
The fantastic coloration and behavioral displays in the birds of paradise that we watched in class were examples of differential sexual selection driven by: a. Female-female combat b. Male competition c. Female choice d. Intrasexual selection
Some physical traits are a disadvantage for species survival, explain the role sexual selection plays in maintaining these traits in the population.
Would you expect sexual selection to increase or decrease adaptation of a population to its environment? A. Consider male-male competition first. B. Then consider the different mechanism for the evolution of female preferences and their implications for adaptation to the environment? Explain your thinking.
Natural and sexual selection both lead to evolution, but these processes can work against each other. Differentiate between these two forms of selection and give an example of a situation where natural selection reduces mate choice and sexual selection reduces survival.
The Hardy-Weinberg equation characterizes the allele and genotypefrequenciesa. of a population that is experiencing selection for mating success.b. of a population that is extremely small.c. of a population that is very large and not evolving.d. of a community of species that is not evolving.e. of a community of species that is experiencing selection.
The good genes model of sexual selection is a popular hypothesis for mate choice. What is an underlying flaw with the hypothesis that must be explained?
When it comes to adaptation, survival of a species' trait through artificial selection depends on a) which trait is the fittest for the environment b) which trait humans desire to reproduce c) which trait is the oldest for the species d) which trait has more abundance in the population
The relative fitnesses of A1A1, A1A2, and A2A2 are 0.5,0.8 and 1 respectively. What is the expected result of natural selection in this selection? a.) A1 will increase and A2 will decrease. b.) A2 will increase and A1 will decrease. c. Both alleles will decrease in frequency d.) A stable equilibrium will be achieved in which both alleles are maintained e.) An unstable equilibrium will exist and the outcome depends on the allele frequencies.