Meiosis

Question 1

What does meiosis involve

Answer 1

• 2 divisions
• Creates 4 haploid daughter cells

Question 2

What causes genetic variations in meiosis

Answer 2

• Crossing over between homologous chromosomes
• independent segregation of homologous chromosomes

Question 3

Independent segregation

Answer 3

• occurs during metaphase 1
• homologous pairs of chromosomes line up opposite each these at the equator
• random which side of the equator the paternal and maternal chromosomes from each homologous pair lie
• pair are separate to either end of the cell
• creates large possible combinations

Question 4

Crossing over

Answer 4

• occurs prophase 1
• chromosomes line up opposite each other at the equator
• chromatids become twisted, creating tension, chromatids break
• chromatids recombine with another chromatid
• creates new combinations of alleles

Question 5

How does meiosis differ from mitosis

Answer 5

Meiosis
- 2 divisors
- haploid cells
- introduces genetic variations

Mitosis
- 1 nuclear division
- diploid cell
- genetically identical cells

Question 6

How to identify meiosis

Answer 6

2n —> n