In chickens,the dominant allele Cr produces the creeper phenotype (having extremely short legs).However,the creeper allele is lethal in the homozygous condition.If two creepers are mated,what proportion of the living progeny will be creepers?

Question

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The mating of two creepers (CrCr) results in a 1:2:1 genotype ratio (CrCr:CrCr:Cr+), but since CrCr is lethal, those individuals do not survive. This leaves a 2:1 ratio of surviving offspring, with two-thirds being creepers (CrCr) and one-third being normal (Cr+).

In Chickens,the Dominant Allele Cr Produces the Creeper Phenotype (Having