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?

Punnett square. Please detail information and how do you know if a gene is sex linked thank you

Explanation / Answer

part B-

If we consider the color of body with M and length of feathers as L, then the genotypes of the parents are as following.

Metallic blue-colored Indian blue peahen with long pinion = MmLl

Brown-colored Indian blue peacock with short pinion =mmll

Now cross between parents-

Gametes

ml

ML

MmLl metallic blue with long pinions

Ml

Mmll metallic blue with short pinions

mL

mmLl dull brown with long pinions

ml

mmll dull brown with short pinions

Part A- no gene is linked because each type of genotype has equal numbers of progenies. It suggests there is no linkage. If linkage occurred, then any of the genotype must have high numbers of progenies.

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Gametes

ml

ML

MmLl metallic blue with long pinions

Ml

Mmll metallic blue with short pinions

mL

mmLl dull brown with long pinions

ml

mmll dull brown with short pinions

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