Normal growth dominates over gigantism, early maturity over late maturity. The genes for both traits

Normal growth dominates over gigantism, early maturity over late maturity. The genes for both traits are on different pairs of chromosomes. What traits will the hybrids obtained from crossing heterozygous parents for both traits have? What is the phenotype of the parent individuals?

Let’s designate the gene for normal growth – A, gigantism – a, early maturity – B, late maturity – b.

Genotypes of parental individuals AaBb.

R: AaBb x AaBb – early maturing, normal growth;

G: AB, Ab, ab, ab x AB, Ab, ab, ab – possible gametes;

F1: Let’s use a Pennett lattice for a dihybrid crossing. Analyzing genotypes, we find phenotype splitting: early maturing, normal growth – 56.25%;

early ripening with gigantism – 18.75%;

late ripening, normal growth – 18.75%;

late ripening with gigantism – 6.25%.