Answer:
The ratio of offspring that have round seeds and yellow seed color in a dihybrid cross is 9 out of 16.
WHAT IS A DIHYBRID CROSS:
• A dihybrid cross is a cross between two individuals that are are heterozygous for two genes.
• In this question, a gene involving seed color and seed shape is used. The allele for round shape (R) and yellow seeds (Y) are dominant over wrinkled (r) and green seeds (y).
A cross between two dihybrid i.e. RrYyx RrYy will result in the following offsprings:
R_Y_-9
R_yy - 3 rrY_ - 3
rryy - 1
Therefore, the ratio of offspring that have round seeds and yellow seed color in a
dihybrid cross is 9 out of 16.
