describe the causes and effects of inherited conditions such as haemophilia andred-green colour blindness (sex-linked inheritance), polydactyly (dominant allele) andcystic fibrosis (recessive allele)

Causes and Effects of Inherited Conditions:

1. Haemophilia and Red-Green Colour Blindness (Sex-Linked Inheritance):

Causes: These conditions are caused by mutations in genes located on the X chromosome. Males are more likely to have these conditions because they have only one X chromosome. If the X chromosome they inherit has the mutation, they will have the condition. Females, on the other hand, need mutations on both of their X chromosomes to have the condition.

Effects: Haemophilia is a condition that affects the blood's ability to clot, leading to excessive bleeding and bruising. Red-green colour blindness is a condition that affects the ability to distinguish between red and green colours.

2. Polydactyly (Dominant Allele):

Causes: Polydactyly is caused by a dominant allele, which means that only one parent needs to pass on the mutated gene for the child to have the condition.

Effects: Polydactyly results in the individual having more than the usual number of fingers or toes.

3. Cystic Fibrosis (Recessive Allele):

Causes: Cystic fibrosis is caused by a recessive allele, which means that both parents must pass on the mutated gene for the child to have the condition.

Effects: Cystic fibrosis primarily affects the lungs and digestive system, leading to a buildup of thick, sticky mucus that can cause breathing problems and other issues.