In birds, males are homogametic and females are heterogametic. You cross a white
ID: 3166361 • Letter: I
Question
In birds, males are homogametic and females are heterogametic. You cross a white rooster to a black hen and to your surprise you see all grey roosters and all white hens in the progeny. You decide to perform a reciprocal cross (black rooster x white hen) and observe all grey roosters and all black hens in the progeny. Predict the ratios and phenotypes of the progeny if you cross the grey roosters to the white hens (F1s from first cross above).
A. 1 grey rooster: 1 white rooster: 1 black hen: 1 white hen
B. 1: black rooster: 1 white rooster: 1 black hen: 1 white hen
C. 1:black rooster: 1 grey rooster: 1 black hen: 1 white hen
D All grey roosters and hens
Explanation / Answer
Answer:
1).
ZBZB (male-White) x Zb W (female-black)
2).
Zb Zb (black rooster-male) x ZB W (white hen-female)---Parents
3). ZB Zb (grey roosters) x ZB W (white hens) ------Parents
A. 1 grey rooster: 1 white rooster: 1 black hen: 1 white hen
Zb W ZB ZBZb (gray rooster) ZBY (white hen)Related Questions
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