causes of genetic variation Flashcards
1
Q
what are three causes of genetic variation?
A
independent assortment
crossover
random fertilization
2
Q
what is independent assortment?
A
random segregation
random positioning of tetrads along cell equator
3
Q
when does independent assortment occur?
A
meiosis I
4
Q
what is crossover?
A
chiasma
number of crossovers between non-sister chromatids depends on the size of the chromosome (up to 2-3 crossovers per chromosomes)
5
Q
when does crossover occur?
A
prophase I
6
Q
what is random fertilization?
A
ovum is fertilized by a sperm to create a zygote
genetic material in each gametes is different
