In chickens, the white plumage (P) of the leghorn breed is dominant over colored

Question

In chickens, the white plumage (P) of the leghorn breed is dominant over colored plumage (p), feathered shanks (S) are dominant over clean shanks (s), and pea comb (C) is dominant over single comb (c). Each of these gene pairs segregates independently. If a homozygous white, feathered, pea combed chicken is crossed with a homozygous colored, clean, single combed chicken and the F1s are mated with colored, clean, single-combed birds, what proportion of the birds in the F2 will produce only white, clean, pea-combed progeny? Justify your answer by showing intermediate diagrams/calculations.

In humans, red-green color blindness (b) is recessive and X-linked, whereas albinism is recessive (a) and autosomal. What proportion of their children will color-blind with albinism when two homozygous parents (a normal-visioned albino woman and a color-blind, normally pigmented man)? Give your answer separately for males and females, if needed. Draw a diagram and show your calculations to justify your answer.

Explanation / Answer

First generation cross is :- PPSSCC x ppsscc

Gametes will be PSC and psc

F1 progeny will be PpSsCc

Second generation cross is PpSsCc X ppsscc

Gametes will be PSC, PSc, Psc, PsC, pSC, psC, pSC, psc and psc.

Qs. is what proportion of the population is white P_, clean,ss, and pea combed C.

PpSsCc

white, feathered, pea

PpSscc

white,feathered,single

Ppsscc

white,clean,single

PpssCc

white, clean,pea

ppSsCc

colored, feathered, pea

ppssCc

colored, clean,pea

ppSsCc

colored,feathered,pea

ppsscc

colored,clean, single

so, 1/8 of the population will be white, clean,pea.

ans 2. Genotype of woman is normal visioned, albino aaX_

Genotype of man is color blind, normally pigmented, A_XbY

To find :- proportion of color blind children with albinism(note:- it should have been mentioned whether the man and woman is carrier or not.. I am considering no one to be a carrier)

aaXX crossed with AAXbY

All the girls will be carriers of color blindness, with genotype XXb and non-albino with genotype Aa

All boy will be normal visioned, with genotype XY and non- albino with genotype Aa

PSC PSc Psc PsC pSC psC pSC psc psc

PpSsCc

white, feathered, pea

PpSscc

white,feathered,single

Ppsscc

white,clean,single

PpssCc

white, clean,pea

ppSsCc

colored, feathered, pea

ppssCc

colored, clean,pea

ppSsCc

colored,feathered,pea

ppsscc

colored,clean, single

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