Alleles & Appearance – Post Lesson Practice

Copy and complete the following sentences.

1. The outward appearance of an organism for a particular

characteristic is known as its ______________ and is always

written in __________. the alleles it carries for this characteristic

are known as its _______________ and this is written using

_____________ symbols. (4)

2. Individuals which have the same two alleles for a gene are

described as _____________, whereas those which have different

alleles are ______________. (2)

3. The _____________ allele always shows in the phenotype, but the

_______________ allele only shows in the phenotype when two of

them are present. (2)

4. In mice, the allele for black coat (B) is dominant to the allele for

white coat (b), so a heterozygous mouse will be __________ in

colour and have the genotype __________. (2)

Total = 10