In a particular kind of plant, wild-type individuals have purple flowers. Recess

Question

In a particular kind of plant, wild-type individuals have purple flowers. Recessive mutations in the b gene result in blue flowers. Recessive mutations in the w gene result in white flowers. The w mutation is epistatic to b. A purple-flowered plant heterozygous for both b and w was test-crossed with a white-flowered plant homozygous for the recessive alleles of both genes. The actual results obtained from the cross described were as follows: 40 purple flowers, 10 blue flowers, and 50 white flowers. What is the genetic distance between b and w?

Explanation / Answer

Genetic distance between the white flower and blue flower equal to the final result of purple flowers.

Therefore the distance is equal to = w-b

= 50-10

= 40.

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