Monday, August 22, 2011

3.1 Sexual and Asexual Reproduction





1. Organisms that show sexual reproduction show sexes >; can identify what is male and female
2. Asexual > Cannot differentiate between male and female
3. Sexually reproducing organisms produce cells called gametes > take the form in the male of the sperm cell > and in the female of the egg cell
4. in plants, the sperm cell is knows as the pollen grain > the egg is knows as the ovule
5. Asexually reproducing populations have no gametes
6. The type of cell division that produces gametes is called meiosis > Effects is to half the total number of chromosomes in the gamete cells. > offspring has half for both
7. There is a total of 46 chromosomes per cell. In gametes, there is only 23, per gamete cell.
8. Halving the chromosomes per cells to gametes is called meiosis
9. In asexual reproduction, there is no meiosis, mitosis and binary fission.
10. In this process, the number of chromosomes is remained constantly. > EG - a cell with 20 chromosomes will divide to make 2 cells with 20 chromosomes in each.
11. Sexually reproducing > process of fertilisation > egg and sperm cell fuse together
12 Asexual, there is no gametes, therefore no fertilisation
13. Sexually producing > variation between offspring > broad variation
14 Asexual have a very small amount of variation due to mutation > knows a clone

Question -- Why dont asexually reproducing organisms vary? Is this because they make cloned cells with the same number of chromosomes?

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