During sexual reproduction, each offspring received two alleles of each gene. This combination of alleles affects the characteristics that the offspring has.

In this topic you need to know about the following: -

  • What the key terms such as heterozygous, homozygous, allele, genotype, phenotype, dominant and recessive mean.
  • How to draw Punnett square diagrams.
  • How tro calculate the probability of an offspring having a particular trait.
  • How to explain how sex is inherited.

    • Use the arrows below to continue to revise.

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