5) A metallic blue-colored Indian blue peahen with long pinion feathers is cross

Question

5) 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?

please answer all questions do I do the punnett square using Z for male And W for female or BbLl x bbll thank you

Explanation / Answer

A) Clearly, no gene is sex-linked as both, peahens and peacocks have both type of colors and length of pinions.

B) Now let us denote the dominant allele for color by B, resulting in blue color. Homozygous recessive types, i.e. bb will have brown color. Dominant allele for length, L, resulting in long pinions. Now males would be homogametic with ZZ chromosomes whereas females would be ZW.

Hence, genotype of parent peahen - ZW(sex), BbLl,

genotype of parent peacock - ZZ(sex), bbll

genotype of oppspring(peacock, blue, long pinions) - ZZ(sex), BbLl

genotype of oppspring(peacock, blue, short pinions) - ZZ(sex), Bbll

genotype of oppspring(peahen, brown, long pinions) - ZW(sex), bbLl

genotype of oppspring(peahen, brown, short pinions) - ZW(sex), bbll

You should draw the punnett square for BbLl x bbll.

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