IB Biology SL D3.2.10 Incomplete Dominance and Codominance Questions

Distinguish codominant expression from an intermediate incomplete-dominance phenotype, then predict offspring ratios in IB Biology SL D3.2.10.

Exam points

Distinguish codominance, in which both alleles are expressed in a heterozygote, from incomplete dominance, in which the heterozygote has an intermediate phenotype.
Predict or interpret offspring phenotypes and ratios from a codominant or incompletely dominant cross, including the named parental and heterozygous traits.

[Maximum number: 1]

A Mirabilis jalapa plant with red flowers was crossed with one with white flowers. All plants in the F1 generation had pink flowers. What phenotype ratio would be expected in the F2 generation?

100 % pink

50 % red and 50 % white

25 % white, 50 % pink and 25 % red

75 % red and 25 % white

All question bank results loaded

IB Biology SL D3.2.10 Incomplete Dominance and Codominance Questions question 1