Heredity

Question 1

What are homologous chromosomes?

Answer 1

Contain the same genes, however have a different expression of that gene.

Question 2

What are Alleles?

Answer 2

Are different expressions of a particular gene. E.g eye colour

Question 3

What are dominant alleles?

Answer 3

If this allele is present on either homologous chromosomes, its physical appearance will be expressed (masking the other allele)

Question 4

What are recessive alleles?

Answer 4

This must be present on both homologous chromosomes in order to be physically expressed (otherwise it will be masked by the dominant allele).

Question 5

What is Sex- linked inheritance?

Answer 5

X-linked traits -Genotypes:
Females (XX)
Males (XY)- Males will only inherit one allele of the x-linked gene.

Question 6

What is homozygous dominant?

Answer 6

A genotype where an individual inherits two copies of a dominant gene
e.g AA

Question 7

What is Homozygous recessive?

Answer 7

A genotype where it carries two copies of the same recessive allele.
e.g aa

Question 8

What is Heterozygous?

Answer 8

having two different alleles of a particular gene or genes.
e.g Aa