Inheritance, Populations And Evolution

Question 1

What is co-dominance?

Answer 1

Occurs where instead of one allele being dominant and the other recessive, both alleles are equally dominant. This means that both alleles of a gene are expressed in the phenotype.

Question 2

What is sex linkage?

Answer 2

Any gene that is carried on either the x or y chromosome is said to be set linked.

Question 3

What is autosomal linkage?

Answer 3

All the genes on a single chromosome form a linkage group. The genes carried on the sex chromosomes are said to be sex linked. The remaining 22 chromosomes are called autosomes. The name given to the situation where two or more genes are carried on the same autosome is called autosomal linkage.

Question 4

What is Epistasis?

Answer 4

Arises when the allele of one gene affects or masks the expression of another in the phenotype

Question 5

What is epigenetics?

Answer 5

•Involves changes in gene function without changes to the base of DNA
•Changes to the epigenome are caused by changes in the environment and can cause epigenetic changes