Examination of thousands of plants in a certain species revealed a range in PUbescence from 60  hairs/cm2to the glabrous (non-pubescent) condition. Assume that this variability is controlled by  3 pairs of genes acting in a cumulative manner. Ignore the environmental effect. When entirely  pubescent (60 hairs/cm2) were crossed with glabrous plants (0 hairs/cm2), all Fl offspring exhibited  an intermediate pubescent condition (30 hairs/cm2). Several of the Fl plants were selfed and the F2 plants were evaluated for pubescence.  a. Assign genotypes to the original plants and the Fl plants. Label clearly.  b. What proportion of the F2 progeny would be expected to be :   - completely pubescent (60 hairs/cm2)?  - intermediate pubescent (30 hairs/cm2)?  - with 40 hairs/cm2?  - homozygous for the genes involved ?

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