Incomplete / Co-Dominance – Post Lesson Practice

Copy and complete the following sentences.

1. If one allele is equally dominant with another it is said to be

______________. This occurs with coat colour in horses. If a black

stallion is crossed with a black mare, the offspring are all

_____________. But when a black stallion is crossed with a white

mare the offspring are grey ____________ which have coats made up

of black hairs and ____________ hairs. (4)

2. When both alleles are equally __________, the symbols for the

alleles are both given _____________ letters. (2)

3. Black horses, genotype __________, and ___________ horses,

genotype WW, are homozygous. The roan horses, genotype

____________, are _____________. (4)

Total = 10