variation and selection

Question 1

what causes variation

Answer 1

crossing over during meiosis
random assortment in meiosis
random fusion of gametes
mutation

Question 2

what is mutation

Answer 2

spontaneous genetic change which causes new alleles to be formed. it happens randomly

Question 3

what causes mutation

Answer 3

pass on from ovary/testes (hereditary)
random
long term exposer to mutagens

Question 4

what is mutagens

Answer 4

substances (chemicals and radiation) that increases rate of mutation