Question

If two heterozygotes are crossed, what kind of phenotypic ratio would be obtained for dominant and recessive traits. Show the cross by a Punnett square. Is it different from genotypic ratio? Explain.

If two heterozygotes are crossed, what kind of phenotypic ratio would be obtained for dominant and recessive traits. Show the cross by a Punnett square.

Answer 1

For Aa × Aa, each parent produces A and a gametes. Punnett outcomes are AA, Aa, Aa and aa. Genotypic ratio = 1 AA : 2 Aa : 1 aa; phenotypic ratio = 3 dominant : 1 recessive. The ratios differ because AA and Aa have the same dominant phenotype.