In a dihybrid cross,if the P generation consists of plants that are true breeding (one is homozygous dominant,the other homozygous recessive)then the F2 generation will consist of organisms that exhibit what phenotypic ratio?
A) 3 dominant for both traits : 9 dominant for trait #1 and recessive for trait #2 : 3 dominant for trait #2 and recessive for trait #1 : 1 recessive for both traits
B) 3 dominant for both traits : 3 dominant for trait #1 and recessive for trait #2 : 3 dominant for trait #2 and recessive for trait #1 : 1 recessive for both traits
C) 9 dominant for both traits : 3 dominant for trait #1 and recessive for trait #2 : 3 dominant for trait #2 and recessive for trait #1 : 1 recessive for both traits
D) 9 dominant for both traits : 1 dominant for trait #1 and recessive for trait #2 : 3 dominant for trait #2 and recessive for trait #1 : 1 recessive for both traits
E) None of these

Question

Quizplus · Accepted Answer

When the P generation consists of true breeding plants (homozygous dominant for one trait and homozygous recessive for the other trait), the F1 generation will all be heterozygous for both traits. When the F1 generation produces gametes, the two alleles for each trait will segregate independently, resulting in a 9:3:3:1 phenotypic ratio in the F2 generation. This means that 9 individuals will be dominant for both traits, 3 will be dominant for trait #1 and recessive for trait #2, 3 will be dominant for trait #2 and recessive for trait #1, and 1 will be recessive for both traits. Therefore, choice C is the correct answer.

In a Dihybrid Cross,if the P Generation Consists of Plants