Genetics

Question 1

What is a homologous chromosome?

Answer 1

A pair of chromosomes with maternal and paternal origin

Question 2

What is incomplete dominance? (Simple inheritance)

Answer 2

A heterozygous genotype that expresses a phenotype that is intermediate between a homozygous dominant and a homozygous recessive expression.

Eg. A little of each - has is Ff for cystic fibrosis but still has a mild form of the disease.

Question 3

3 process that result in genetic variation? (How are we all so different)

Answer 3

Meiosis: independent assortment chromosomes

Meiosis: crossover of homologous chromosomes

Random fertilisation of egg by sperm

Question 4

What is genotype?

Answer 4

A persons genetic makeup (eg FF = homozygous dominant, Ff = heterozygous, Ff = homozygous recessive)

Question 5

What is phenotype

Answer 5

A persons physical expression of their genes (eg. FF = freckles, Ff = freckles, ff= no freckles)