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4 Terms

1
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Other than the effect of environmental factors, explain how this variation in phenotypes could be caused

(4 marks)

  • individuals having different alleles

  • mutations, changes in the base sequence of DNA

  • meiosis

  • random fertilisation of gametes

2
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what does reproductively isolated mean and give one suggestion of how this may have occurred.

(3 marks)

  • This means that changes in allele frequency have caused changes in the phenotypes of the two species of fish

  • and therefore they cannot interbreed to produce fertile offspring.

  • They may be reproductively isolated because of differences in their behaviour/ different breeding times during the year.

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