SB3e Genetic Variants And Phenotypes

Question 1

Allele

Answer 1

Most genes come in different versions called alleles. So a gene for eye colour may have one version (allele) that can cause dark eyes, and another allele that can cause pale eyes.

Question 2

Genetic disorder

Answer 2

A problem caused by genes.

Question 3

Mutation

Answer 3

A change to a gene caused by a mistake in copying the DNA base pairs during cell division, or by the effects of radiation or of certain chemicals.

Question 4

Phenotype

Answer 4

The characteristics that a certain set of alleles display.