Question

In a dihybrid cross, round (RR), yellow (YY) seeds were crossed with wrinkled (rr), green (yy) seeds. What were the phenotypes of the F1 generation?

all round and yellow
all wrinkled and green
half round and yellow; half wrinkled and green
3:1 (round and yellow to wrinkled and green)

Answer 1

The correct answer is all round and yellow.

As you can see in the punnet square presented below, all of the offspring from the RRYY X rryy cross have the RrYy, heterozygote genotype.

Since R and Y are the dominant alleles, the heterozygotes express the same traits as the dominant parent, yellow and round seeds.

Answer 2

The phenotypes of the F1 generation were all round and yellow. The correct answer between all the choices given is the first choice. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.