In an imagined transduction experiment with alleles a⁺,b⁺,and c⁺,a⁺ alone was transduced into an auxotroph 1400 times,b⁺ alone 1200 times,and c⁺ alone 970 times.Genes a⁺ and b⁺ were both found 10 times,b⁺ and c⁺ 2 times,and a⁺ and c⁺ one time.What can you conclude?
A)Cotransduction is too infrequent to be used to map genes.
B)Genes a and c cotransduce only accidentally.
C)Genes a and b are more closely linked than a and c or b and c.
D)Genes a and c are found together only if double crossovers have occurred.
E)Transduction of gene c is very rare.

Question

Quizplus · Accepted Answer

The fact that genes a⁺ and b⁺ were both found 10 times while b⁺ and c⁺ were found only twice suggests that genes a⁺ and b⁺ are more closely linked than b⁺ and c⁺. This is because cotransduction frequency is inversely proportional to the distance between two genes. There is no evidence to suggest that cotransduction is too infrequent to map genes or that genes a and c cotransduce only accidentally. The data does not provide any information about double crossovers, so D cannot be concluded. The frequency of transduction of gene c cannot be determined from the given data.

In an Imagined Transduction Experiment with Alleles A⁺,b⁺,and C⁺,a⁺ Alone