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23 August, 12:47

Two genes of a flower, one controlling blue (b) versus white (w) petals and the other controlling round (r) versus oval (o) stamens, are linked and are 10 map units apart. you cross a homozygous blue-oval plant with a homozygous white-round plant. The resulting f1 progeny are crossed with homozygous white-oval plants, and 1,000 f2 progeny are obtained. How many f2 plants of each of the four phenotypes do you expect?

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  1. 23 August, 15:51
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    The offspring genotype in F2 generation is -

    bwoo: wbor: worw: wwoo

    So its ratio is

    4:4:4:4

    1:1:1:1

    Thus number of individual in each genotype group out of 1000 is 250

    Explanation:

    Given -

    homozygous blue-oval plant is crossed with homozygous white-round plant

    Genotype of homozygous blue-oval plant - bboo

    Genotype of homozygous white-round plant - wwrr

    The ofspring produced in F1 generation will have genotype - bowr

    In F2 generation, "bowr" is crossed with homozygous white-oval plants "wwoo"

    The following offspring are produced -

    bwor - bo, br, wr, wo

    wwoo - wo, wo, wo, wo

    bo br wr wo

    wo bwoo wbor worw wwoo

    wo bwoo wbor worw wwoo

    wo bwoo wbor worw wwoo

    wo bwoo wbor worw wwoo

    The offspring genotype is -

    bwoo: wbor: worw: wwoo

    So its ratio is

    4:4:4:4

    1:1:1:1

    Thus number of individual in each genotype group out of 1000 is 250
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