Question

In the progeny of dihybrid cross of pea plant, the phenotype ratio between the proportions of recombinants and parent plants respectively is

• A. 2:4
• B. 4:2
• C. 3:5
• D. 5:3

Hint:

In a dihybrid cross, the typical ratio of parent to recombinant plants in terms of phenotype is often 3:5.

Answer 1

The Correct Option is C

Dihybrid Cross: Phenotypic Ratio of Recombinants and Parent Plants

In a dihybrid cross, two traits are inherited independently according to Mendelian inheritance. When considering the phenotype ratio between recombinants and parent plants in the F₂ generation:

• Parent Plants: These plants retain the original combination of alleles and produce offspring with the same genotype and phenotype.
• Recombinants: These plants result from genetic recombination between homologous chromosomes during meiosis, producing new combinations of alleles that differ from the parents.

For a typical dihybrid cross, the expected phenotype ratio between recombinants and parent plants is 3:5.
This is because, in Mendelian genetics, the recombination frequency typically results in a higher number of parent plants compared to recombinants.

Thus, the correct ratio is 3:5.

Therefore, the correct answer is (3) 3:5.