Dihybrid crosses can be conducted with two organisms that are heterozygous for two different traits: SsYy x SsYy for example. Which genotypic ratio shows that genes in dihybrid crosses are inherited according to the principle of independent assortment?

Question

A.
25:25:25:25

B.
50:50

C.
3:1

D.
9:3:3:1

Answer 1

The correct answer is D. 9:3:3:1.

In a dihybrid cross like SsYy x SsYy, the principle of independent assortment states that the alleles for different traits segregate independently of one another during gamete formation. The resulting phenotypic ratio for the offspring is typically 9:3:3:1, which reflects the combinations of the traits produced when both traits are considered simultaneously.