Since the homozygous dominant genotype would be lethal, the genotype of chickens with the creeper phenotype should be heterozygous. Thus, this isa heterozygous cross. The Punnet square of Crcr x Crcr is shown below:
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 their living progeny will be creepers?
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