AP BIOLOGY

Detailed explanation-1: -The genotypic ratio for this cross is written 1:2:1. In animals and plants, each gene has 2 alleles or variations, one from each parent. When male and female gametes come together (cross) all the phenotype variations for the offspring are predicted using the Punnett square grid.

Detailed explanation-2: -The two allelic pairings assort separately into the gametes in this case. A dihybrid cross has a genotypic ratio of 1:2:2:4:1:2:1:2:1.

Detailed explanation-3: -A cross of two F1 hybrids, heterozygous for a single trait that displays incomplete dominance is predicted to give a 1:2:1 ratio among both the genotypes and phenotypes of the offspring.