A dihybrid was produced from the cross of A/A B/B and a/a b/b. The dihybrid is testcrossed to produce the following progeny:
• A/a B/b
• a/a b/b
• A/a B/b
• A/a b/b
• a/a b/b
• A/a B/b
• a/a B/b
The results do not give us many details about linkage. Though the number of recombinants is lesser than the number of parentals, the recombinant frequency may not be less than 50%. Since the sample size is small, the presence or absence of one individual will affect the ratio. A larger sample size is required to determine whether linkage is present or not.