Under what circumstances may variation not occur in sexually produced individuals.

  • When fertilization occurs between closely related individuals, the offspring produced may not show much variation.
  • When crossing over does not occur during meiosis when the gametes are formed fusion of the gametes produces offspring identical to the parents.
  • In hermaphrodism, only one parent is parent is involved and therefore there is not much variation
  • Gametes may be produced by mitosis and self-fertilization may occur e.g. in ferns and mosses
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