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5.3 Genes and Inheritance

  • Can you recall the meaning of the following terms: dominant, recessive, homozygous, heterozygous, phenotype, genotype and codominance?
  • Can you use genetic diagrams to show monohybrid inheritance and predict genotype outcomes?
  • Can you interpret family pedigrees?
  • Can you recall what determines someone’s sex?
  • Can you use a genetic diagram to show how sex is determined at fertilisation?

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This YouTube video introduces the great scientist Mendel and the experiments he did to understand how inheritance works.

Click here to learn more about heredity with this simple video from Tim and Moby.

Click here to watch a clip explaining what the terms dominant and recessive mean.

Click here to learn about how you inherit your eye colour.

Click here to investigate different allele combinations and how they effect the eye colour of a baby.

Click here to see how a monohybrid cross occurs and test your knowledge using punnett squares.

Click here to practice completing a punnett square for the characteristic tongue rolling.

Click here to learn about what makes you a male or female.

Click here to complete a genetic cross to determine sex.

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Extension material

Click here to see how the genetic disease cystic fibrosis is passed on.

Click here to see how the dominant allele that causes Huntington’s disease is passed on.

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