27. Heterozygous Cp cp chickens express a condition called creeper, in which the
ID: 211787 • Letter: 2
Question
27. Heterozygous Cp cp chickens express a condition called creeper, in which the leg and wing bone are shorter than normal (cp cp). The dominant Cp allele is lethal when homozygous. Two alleles of an independently segregating gene determine white (W) versus yellow (ww) skin color. From a mating between chickens heterozygous for both genes, what phenotypic classes will be represented among the viable progeny, and what are their expected relative frequencies? Please show using the branch diagram method.Explanation / Answer
According the question, cross between Cpcp Ww and Cpcp Ww will bring the following result-
Gametes
CpW
Cpw
cpW
cpw
CpW
CpCpWW =Die
CpCp Ww =Die
CpcpWW
CpcpWw
Cpw
CpCpWw=Die
CpCpww=Die
CpcpWw
Cpcpww
cpW
CpcpWW
CpcpWw
cpcpWW
cpcpWw
cpw
CpcpWw
Cpcpww
cpcpWw
cpcpww
Out of 16 progenies-
Four are dead
Creeper & white = 6
Relative frequency = 6/16 = 0.375
Creeper & yellow= 2
Relative frequency = 2/16 = 0.125
Normal & white =3
Relative frequency = 3/16 = 0.1875
Normal & yellow =1
Relative frequency = 1/16 = 0.0625
Gametes
CpW
Cpw
cpW
cpw
CpW
CpCpWW =Die
CpCp Ww =Die
CpcpWW
CpcpWw
Cpw
CpCpWw=Die
CpCpww=Die
CpcpWw
Cpcpww
cpW
CpcpWW
CpcpWw
cpcpWW
cpcpWw
cpw
CpcpWw
Cpcpww
cpcpWw
cpcpww
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