variation in phenotype

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5 Terms

1
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what is a mutation ?

a sudden change to genes & chromosomes that may or may not be passed on to the next generation

2
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what is meiosis?

produces new combinations of alleles before they're passed into the gamete - all of which are therefore different

3
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what is random fertilisation of gametes ?

in sexual reproduction this produces new combinations of alleles - therefore offspring are different to parents

4
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causes of genetic variation ?

  • mutations

  • meiosis

  • random fertilisation of gametes

5
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examples of environmental variation ?

  • poor light

  • nitrates

  • pH

  • diet

  • parental influence