In a dihybrid cross involving two autosomal traits on different chromosomes in which the parents are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
A)1 out of 16
B)3 out of 16
C)6 out of 16
D)9 out of 16

Question

Quizplus · Accepted Answer

In a dihybrid cross involving two autosomal traits on different chromosomes, the ratio of offspring genotypes is 9:3:3:1 (where 9 is the dominant phenotype for both traits, 3 is the dominant phenotype for one trait and the recessive phenotype for the other, 3 is the recessive phenotype for one trait and the dominant phenotype for the other, and 1 is the recessive phenotype for both traits). Therefore, out of 16 offspring, only one is expected to be homozygous recessive for both traits (1/16 = 6.25%).

In a Dihybrid Cross Involving Two Autosomal Traits on Different