Question

In a heterozygote cross (aa x aa) what is the probability of producing offspring that exhibit the dominant phenotype for this trait?

Answer 1

Let 'A' denote the dominant allele and 'a' denote the recessive allele. The heterozygous cross will involve a cross between Aa and Aa i.e, Aa x Aa. The image shows the cross using a Punnett square to give an idea about the resultant offspring genotypes. The resultant offspring will have 3 dominant phenotype (yellow colored) and 1 recessive phenotype. Thus the probability of the dominant phenotype in the offspring is 75% or 3/4.