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26 February, 12:16

A test cross was made between true-breeding EEWW flies and eeww flies. The resulting F1 generation was then crossed with eeww flies. 100 offspring in the F2 generation were examined, and it was discovered that the E and W genes were not linked. Which is the correct genotype of the F2 offspring if the genes were linked and if the genes were not linked?

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  1. 26 February, 13:09
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    If the genes were linked:

    Parental cross: EW/EW X ew/ew

    F1 genotype: EW/ew

    F1 Gametes:

    - Parentals (more abundant) : EW and ew

    - Recombinant (less abundant) : Ew and eW

    Test cross: EW/ew X ew/ew

    F2 genotypes:

    Parentals: EW/ew; ew/ew; Recombinant: Ew/ew; eW/ew

    If the genes are not linked:

    Parental cross: EEWW X eeww

    F1 genotype: EeWw

    F1 gametes: EW, Ew, eW, ew. Genes assort independently, so all of the possible gametes of the F1 individual will have the same probability.

    Test cross: EeWw X eeww

    F2 genotypes:

    1/4 EeWw, 1/4 Eeww, 1/4 eeWw, 1/4 eeww
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