3.7.1.2 Dihybrid inheritance

Question 1

What is the genotype of a pure breed?

Answer 1

homozygous for both traits

Question 2

In dihybrid crosses, when 2 heterozygotes for both traits are crossed, what is the phenotype ratio?

Answer 2

9 dominant dominant : 3 dominant recessive : 3 recessive dominant : 1 recessive recessive