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Question 3 In chickens, the dominant lethal allele Cr produces the creeper phenotype (very short legs)....

Question 3 In chickens, the dominant lethal allele Cr produces the creeper phenotype (very short legs). The allele is lethal when homozygous. If two creepers are mated, what proportion of progeny will have the creeper phenotype? Group of answer choices

A. 1/2

B.1/3

C.3/4

D. 2/3

E. 1/4

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Answer #1

Homozygous Creeper is lethal and thus they die.

The chicken showing creeper phenotype is Heterozygous as the allele C is dominant.

Allele for creeper phenotype = C

Allele for normal phenotype = c

There is a cross between two creepers :-

Parents :- Cc × Cc

Gametes :- C & c × C & c

Offsprings :-

M⬇️/ F➡️ C c
C CC (Creeper lethal) Cc (Creeper)
c Cc (Creeper) cc (Normal)

Creeper : Normal = 3:1

Thus proportion of progeny having creeper phenotype is 3/4.

So the correct answer is (c) 3/4.

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