A cross between two inbred plants thathad mean seed weights of 20 and 40 grams,

Question

A cross between two inbred plants thathad mean seed weights of 20 and 40 grams,
respectively, produced an F1 generation with a seeds weighing anaverage of 30
grams each.
An F1 × F1 cross produced 1000 plants: 3 had seeds weighing20 grams, 5 had seeds weighing 40 grams, and the others producedseeds with weights varying between these extremes.
If you hypothesize that the alleles controlling seed weight in thisorganism cooperate additively, how many gene pairs are involvedin determining seed weight differences in these plants?

Explanation / Answer

This seems to be a simple Mendelian inheritance problem, only onepair of genes should control this trait (heavy or light seedalleles). This can be determined in the F1 generation, if more than1 gene pair controlled this trait then you would see much morevariation in just the F1 generation, but you don't because theparents are inbred (they are homozygous for the traits theycarry).

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