Question

In a pea plant (Pisum sativum) green pod colour is dominant over yellow pod colour. The expected ratio of phenotypes of the first generation offspring in a cross between both the parents with heterozygous green pod colour will be:

• A. 0 : 1
• B. 1 : 1
• C. 2 : 1
• D. 3 : 1

Hint:

In Mendelian inheritance, heterozygous dominant crosses (Gg × Gg) give a 3:1 phenotypic ratio for dominant to recessive traits.

Answer 1

The Correct Option is D

A cross between two heterozygous green pod plants (Gg × Gg) results in the genotypes: GG, Gg, Gg, and gg. The phenotypic ratio is 3 green : 1 yellow, since green is dominant over yellow.