Question

In which kind of cross would you expect to find a ratio of 3 : 1 among the F₂ offspring?

In which kind of cross, a ratio of 3 : 1 is found among the second filial generation offsprings?

Options

• Monohybrid cross

• Dihybrid cross

• Test cross

• None of these

• Back cross

Answer 1

Monohybrid cross

Explanation:

In a monohybrid cross involving a single gene with two alleles, the F₂ generation typically shows a phenotypic ratio of 3:1, where three offspring show the dominant trait and one shows the recessive trait. This classic Mendelian ratio results from the segregation of alleles during gamete formation and their random combination in offspring. Other types of crosses, like dihybrid crosses, yield different ratios (e.g., 9:3:3:1) and test crosses are used for different genetic analysis purposes.