Meiosis and Genetic Diversity

Question 1

What are 4 differences between meiosis and mitosis?

Answer 1

-Meiosis has 2 nuclear divisions but mitosis only have 1
-Meiosis produces 4 cells but mitosis produces 2
-Meiosis produces genetically different cells but mitosis produces genetically identical cells
-Meiosis produces haploid cells but mitosis produces cells with the same number of chromosomes as the parent cell

Question 2

What are the life cycle ‘equations’?
(4)

Answer 2

• 2n—>n (meiosis)
  -2n—>2n (mitosis)
  -n—>n ( mitosis)
  -n+n—>2n (fertilisation)

Question 3

What are the stages of mitosis?

Answer 3

1-Interphase with semi-conservative DNA replication
Chromosomes become replicated chromosomes
2- Meiosis 1 is the first cell division when homologous pairs separate
3- Meiosis 2 is the second cell division when sister chromatids separate
4- You end up with 4 haploid non-identical gametes