Dihybrid Cross

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Last updated 4:14 PM on 6/11/26
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4 Terms

1
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What is a dihybrid cross used to show?

Inheritance of 2 diff characteristics, caused by 2 genes, which may be located on diff pairs of homologous chromosomes

  • Each of these genes can have 2 or more alleles

2
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Example

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3
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What is the expected ratio of a double heterozygous cross? (e.g. YyRr, YyRr)?

9:3:3:1

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Why can the actual ratio of offspring be different to the phenotypic ratio?

  • Fertilisation of gametes is a random process so in a small sample a few chance events can lead to a skewed ratio.

  • The genes being studied are both on the same chromosome AKA linked genes.

    • If no crossing over occurs the alleles for the two characteristics will always be inherited together.