TOP

17.4) Meiosis

17.4) Meiosis

 

Meiosis: is nuclear division, which gives rise to cells that are genetically different.

  • Meiosis takes place in the gonads of animals (eg. the testes and ovaries of mammals)
  • The cells formed are gametes (sperm and egg cells in mammals). Gametes are different from other cells because they have half the normal number of chromosomes (they are haploid).

 

  • Meiosis produces four genetically different haploid cells. Unlike mitosis, meiosis is a reduction division – the chromosome number is halved from diploid

 

  • As a result of meiosis and fertilisation, the maternal and paternal chromosomes meet in different combinations in the zygotes. Consequently, the offspring will differ from their parents and from each other in a variety of ways.

 

Mitosis and meiosis compared:

No comments yet.

Leave a Reply