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11u bio 07
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11u bio 07

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  • For example, human eye colour plays no role in survival.
  • Human hair colour is also a neutral mutation.

11u bio 07 11u bio 07 Presentation Transcript

  • Mutation for Variation
  • Mutation for VariationAll organisms are different, even those of the samespecies. This is due to genetic variation.
  • Mutation for VariationGenetic variation means that genes have differentalleles. Different alleles can by made by mutation.
  • Mutation for VariationMutations may occur in somatic cells or germ cells.Germ cell mutations are passed along to progeny. GERM CELL SOMATIC CELL Germ cells are sex cells, like the Somatic cells are non-sex cells, sperm and egg. like skin or muscle cells.
  • Mutation for VariationThese mutations may be1) harmful 2) neutral 3) beneficial to an organisms and its offsprings survival.
  • Mutation for Variation1) If a harmful mutation is passed-down then theprogeny is less likely to reproduce successfully.Female peacocks choose their mates by the colour of their plumage. Thiswhite peacock mutation greatly reduces the chances it will find a mate.
  • Mutation for Variation 1) This means the harmful mutation is also less likely to be passed along, dying-off with the mutated organism.If an animal is born with 3 legs inthe wild, its chances of survivaldrop drastically.
  • Mutation for Variation2) If a neutral mutation is passed-down to theprogeny then its chances of survival and reproductionare unaffected.
  • Mutation for Variation2) The neutral mutation will probably be passed downmany generations in some organisms.
  • Mutation for Variation3) If a beneficial mutation is passed-down then theprogeny have a higher chance to survive andreproduce. The opposable thumb mutation had great advantages over other animals in that population.
  • Mutation for Variation3) Future generations will also have this mutation andwill also thrive, having many offspring andproliferating this mutation.This lady is resistant to HIV (the AIDS virus) and is more likely to surviveand reproduce in a place where 1 in 4 people are infected with HIV.