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-   -   Dihybrid cross (https://www.askmehelpdesk.com/showthread.php?t=173563)

  • Jan 17, 2008, 02:36 PM
    sexie600
    Dihybrid cross
    Suppose that the father is homozygous dominant for polydactylism and homozygous recessive for normal digit length. The mother is heterozygous for polydectylism and homozygous dominant for brachydectylism
  • Jan 18, 2008, 01:32 PM
    templelane
    The way to deal with a dihybrid cross is to draw it out in a punette square. Give each gene a letter say T for tall. TT would be homozygous dominant for tallness tt homozygous recessive for shortness. Right out the parents genotypes i.e. TT Ll x Tt LL.
    Now right one parent down the square and the other across- just extend a small punnett square and fill in the children's genotypes.

    This site explains it in pictures.

    Give this a go and if you still don't get it post back.

    EDIT I hope those aren't people's phenotypes! Eep!

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