mitosis and meiosis

Question 1

meiosis halves ______, which then becomes _______

Answer 1

the number of chromosomes which then becomes full again in fertilisation

Question 2

meiosis stages

Answer 2

• chromosomes are all copied
• the cell divides into two
• both of these cells divide two more times forming the gametes

Question 3

mitosis stages

Answer 3

• the DNA replicates to form 2 copies of each chromosome
  the cell grows and copies its organelles
• one set of chromosomes is pulled to each pole of the cell, the nucleus divides too
• the cytoplasm and cell membrane form 2 identical cells

Question 4

what happens after fertilisation?

Answer 4

• the new cell divides by mitosis
• this produces a clump of identical cells (embryo)
• as it develops the cells differentiate forming different cell types