Question

Need Help with Problem 8 for Genetics Please!

8. Two strains of a plant called shepherd's purse (Capsella bursapastoris), a widespread lawn and roadside weed of the mustard family, are compared. In strain 1, the recombination frequency between genes A and B is 6%, whereas in strain 2, it is 50%. The Fl progeny from a cross between these strains produce gametes with the following properties: About half are viable and contain only nonrecombinant chromosomes, and about half are nonviable. How can these results be explained? (4 points)

Answer 1

Inversion might have taken place. During recombinations, sometimes inversions ( breakage of DNA and joins again in a reverse direction to the strand of chromosome) do takes place .In case of paracentric and pericentric inversions crossover products are not recovered but for different reasons.

This is as follows:
APACentne Snvem on maion E Invenaion hop to nc 3 viable Ponada nYwon DJation eleion 3 C D Deletion Anon viale CTosS oves