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  • Created by: joe
  • Created on: 09-04-13 15:46

DNA from one generation is passed to the next by gametes

  • Gametes are the sperm cells in the males and egg cells in females. They join together at fertilisation to form a zygote, which divides and develops into a new organism.
  • Normal body cells have the diploid number (2n) of chromosomes - meaning each cell contains two of each chromosome, one from the mum and one from the dad.
  • Gametes have a haploid (n) number of chromosomes - theres only one copy of each chromosomes
  • A fertilisation, a haploid sperm fuses with a haploid egg, making a cell with the normal diploid number of chromosomes. Half these chromosomes are from the father and half from the mother.

Gametes are formed by meiosis

  • The DNA unravels and replicates so there are two copies of each chromosome, called chromatids.
  • The DNA condenses to form double armed chromosomes, made from two sister chromatids
  • Meiosis 1 (first division…


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