Two genes ‘A’ and ‘B’ are linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
a. 1 : 1 : 1: 1
b. 9 : 3 : 3 : 1
c. 3 : 1
d. 1 : 1
