10.4: Genetic variation produced in sexual life cycles contributes to the evolution

Question 1

How can variation be produced ?(3)

Answer 1

• Independent Assortment of Chromosomes
• Crossing over
• Random fertilization

Question 2

Independent Assortment of Chromosomes (3)

Answer 2

• During metaphase 1, maternal and paternal have a 1/2 chance to end up on either cell, segregation is basically anaphase 1

Question 3

recombinant chromosomes

Answer 3

produced by crossing over, genes from 2 different parents, crossing over leads to variation, info is exchanged

Question 4

Random fertilization

Answer 4

there are 70 trillion different ways the zygote can come about; we don’t know which sperm will fertilize which egg

Question 5

OOgenesis

Answer 5

A women-only produces 1 functional; egg and the others disintegrate

Question 6

Spermatogenesis

Answer 6

8 sperm of the same size but different alleles are produced