5. On a remote Pacific island there are Kumquat trees with quantitative genes th

Question

5. On a remote Pacific island there are Kumquat trees with quantitative genes that allow the trees to bear enormous fruit. One strain of tree bears "huge" 20 pound kumquats. Another strain bears "normal" 4 pound fruit (still very large!). Assume that this trait (fruit weight) is controlled by 4 gene loci. From a cross between the "huge" and "normal" strains, what weight fruit will the progeny have? a. 12 b. 16 c. 10 d.4 e. 18 6. Following our simplified model of polygenic inheritance, what is the contribution per allele? a. 1 b. 2 C. 4 d. 6 e. 10 6. If the F2 generation were produced, what proportion of the offspring would you expect to produce 14 pound fruits? 7. b. 128/256 c. 56/256 d. 47/128 e. 1/256 7. When two 12 pound F2 trees were crossed they produced offspring which all produced 12 pound fruit. However, when these offspring were crossed randomly, the fruit produced weighted from 4 to 20 pounds. What can you say about the possible genotypes of the original F2 trees? 8.

Explanation / Answer

1) 16 - For a four gene loci, when the large fruit is dominant to the normal fruits 75% of the alleles will be of the dominant and the remaing one will be of the normal allele. Hence 16 is the answer.

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