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Explain sexual selection in peacocks. Peahen(females) favor peacocks(males) with long showy tail feathers with eye spots. How is that an adaptive thing to do? Then explain how choosing such males can result in more adapted females who do not have long tail feathers.

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Deanna Hettinger
Deanna HettingerLv2
3 Mar 2019

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Related questions

A metallic blue-colored Indian blue peahen with long pinion feathers is crossed with a dull brown-colored Indian blue peacock with short pinion feathers. Half of the resulting peacocks are metallic blue with short pinions and half the resulting peacocks are metallic blue with long pinions. Half of the resulting peahens are dull brown with short pinions and half the peahens are dull brown with long pinions. Long pinions are the result of a functional protein. A) Which gene is sex-linked? B) What are the genotypes of each parent and each type of offspring?

Step 1: Determine whether either of the genes are sex-linked. For this type of a question, if you aren’t told, then the thing for which to look is whether when looking only at the offspring one of the phenotypes sorts out by sex.

In this example, Half of the resulting peacocks are metallic blue with short pinions and half the resulting peacocks are metallic blue with long pinions. Half of the resulting peahens are dull brown with short pinions and half the peahens are dull brown with long pinions.

This suggests what is sex-linked, why?

Step 2: Determine the correct sex chromosomes (if needed) for the species. Step 3: put down allelic place holders for each individual

Peacock Father: _/_ _/_ Peahens Mother: _/_ _/_

Peacock Boys: _/_ _/_ Peahens Girls: _/_ _/_

Step 4 Figure out which allele is functional for each gene. To do this, look at individuals that will be heterozygous for alleles from mom and dad. For sex-linked traits, that would be the homogametic sex (ZZ or XX). For autosomal traits, all offspring will be informative

Step 5: Fill in what you know for sure based on phenotype:

Peacock Father: _/_ _/_ Peahens Mother: _/_ _/_

Peacock Boys: _/_ _/_ Peahens Girls: _/_ _/_

Step 6: Apply Rules 1 & 2 to deduce the unknown alleles:

Peacock Father: _/_ _/_

Peahens Mother: _/_ _/_

Peacock Boys: _/_ _/_

Peahens Girls: _/_ _/_

What are the genotypes of each parent and each type of offspring? Parents genotypes :

Offspring genotypes:

Imagine that you are studying a species of guppy in which mature males are observed to have bright orange tails, while females and immature fish have grey tails. You decide to test whether sexual selection can explain this dimorphism. Describe an experiment to test this hypothesis. Include details about what you will measure. Draw and label two diagrams: one showing potential data that would refute your hypothesis, the other showing potential data that would support it. A competing colleague discovers that some mature males in this population have grey tails, and publishes a paper claiming that this evidence shows that sexual selection could not explain the dimorphism in tail color in this species. Do you agree or disagree? What observations or experiments could help you refute your colleague’s conclusion

4. Imagine that you are studying a species of guppy in which mature males are observed to have bright orange tails, while females and immature fish have grey tails. You decide to test whether sexual selection can explain this dimorphism.

a) Describe an experiment to test this hypothesis. Include details about what you will measure. Draw and label two diagrams: one showing potential data that would refute your hypothesis, the other showing potential data that would support it.

b) A competing colleague discovers that some mature males in this population have grey tails, and publishes a paper claiming that this evidence shows that sexual selection could not explain the dimorphism in tail color in this species. Do you agree or disagree? What observations or experiments could help you refute your colleague’s conclusion?

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