You mate a squash with the genotype AAbb with a squash with the genotype aaBB. The resulting F1 squash are all AaBb. After mating two F1 squash, you obtain an F2 generation of squash as follows: ("-" = either allele)
A- B- 5
A- bb 45
aa B- 47
aa bb 3
Total 100
a) What does this tell you about assortment of the two traits?
b) What could account for the distribution obtained?
What will be an ideal response?
Answer:
a) If A and B assorted independently, the distribution should have been much closer to the predicted ratio of 9:3:3:1.
b) A significant variation form the predicted genotypic ratio is most likely attributable to linkage of the two genes.
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