In chickens, congenital baldness is due to a recessive allele. Crosses are made
ID: 161778 • Letter: I
Question
In chickens, congenital baldness is due to a recessive allele. Crosses are made between bald and normal (wild-type, not bald) chickens, and the results are shown in the table below.
a. Provide a clear genetic explanation for the results shown in these two crosses.
Hens: all wild-type
Roosters: all wild-type
Hens: 50% bald and 50% wild-type
Roosters: all wild-type
Hens: all bald
Roosters: all wild-type
Hens: 50% bald and 50% wild-type
Roosters: 50% bald and 50% wild-type
b. Using defined symbols, state the genotypes of all the chickens
Cross Parents Progeny Hen Rooster F1 F2 1 bald wild-typeHens: all wild-type
Roosters: all wild-type
Hens: 50% bald and 50% wild-type
Roosters: all wild-type
2 wild-type baldHens: all bald
Roosters: all wild-type
Hens: 50% bald and 50% wild-type
Roosters: 50% bald and 50% wild-type
Explanation / Answer
Answer:
a). The inheritance of baldness is sex influenced inheritance.
b).
Cross 1).
ZbW (bald hen) x (wild rooster)ZBZB
F1
F2
ZBZb ( rooster, wild) x ZBW (hen, wild)
Wild hen (ZBW) x Bald roosterc(ZbZb)
F1
F2
ZBZb (wild rooster) x ZbW(bald hen)
ZB Zb ZBZb ( rooster, wild) W ZBW (hen, wild)Related Questions
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