Question

Complementary genes give a characteristic ratio of ______.

Options

• 9 : 3 : 3 : 1

• 9 : 3 : 4

• 9 : 7

• 15 : 1

Answer 1

Complementary genes give a characteristic ratio of 9 : 7.

Explanation:

Complementary genes must both have a dominant allele to produce the particular phenotype. Their interaction modifies the usual dihybrid ratio to 9 : 7.