Gene Interactions

Question 1

What are lethal alleles?

Answer 1

These lead to death in animals that have them, they can be recessive, dominant, or show other interactions such as lethal white overo in horses

Question 2

Incomplete Dominance

Answer 2

Neither allele is completely dominant to the other. This produces a new phenotype where the heterozygous animal will look different to both homozygous animals

Question 3

Codominance

Answer 3

Neither allele is completely dominant to the other, both alleles are shown at the same time in the phenotype.

Question 4

Epistatic effects

Answer 4

This is where one gene affects the expression of another gene

Question 5

Sex-linkage

Answer 5

This is when genes are carried on the sex chromosomes (X or Y)

Question 6

Sex-influenced

Answer 6

The phenotype depends on the gender of the animal even though the gene is controlling that characteristic is not on the sex chromosome. It is influenced by sex hormones.

Question 7

Multiple alleles

Answer 7

This is where three or more alternative alleles of a single gene are possible ( but only two are present in an individual organism )