Genetic Variation

Question	Answer
What are gametes?	Egg and Sperm cells
Where are gametes formed?	Eggs formed in the ovaries and Sperm in the testes
What happens in gamete formation?	23 pair of chromosomes are lined up they split up to form gametes with half the number of chromosomes (23) Each gamete has some of both mum and dads genes allowing genetic variation
Three sources of genetic variation?	Gamete formulation Fertilisation Mutations
What is fertilisation?	When the sperm and egg join to form a new cell the gametes that are chosen are completely random
How does mutation cause genetic variation?	Causes the gene to mutate causing a change and a new characteristics form increasing variation
What factors in the environment affect your characteristics	Health Intelligence Sporting ability
How does health affect characterstics?	Some people get certain diseases such as cancer or heart disease due to personal choices such as smoking or eating junk food etc
How does intelligence affect characteristics?	Genes have some affects however your upbringing and school life have an affect on characteristics
How does sporting ability affect characteristics?	Genes determine potential however training has a massive effect to reach potential

Resource summary

	Created by esther.babatunde over 10 years ago