Question

What is Hybrid Dysgenesis?

1) A series of chromosome defects observed when a Drosophila M male is crossed with a P female
2) A series of chromosome defects observed when a Drosophila P male is crossed with a P female
3) A series of chromosome defects observed when a Drosophila M male is crossed with an M female
4) A series of chromosome defects observed when a Drosophila P male is crossed with an M female

Answer 1

Hybrid Dysgenesis in Drosophila occurs when a P male is crossed with an M female, leading to various chromosome defects in the offspring. (option 4)

Step-by-step explanation:

Hybrid Dysgenesis is a phenomenon observed in the genetic model organism Drosophila melanogaster (fruit fly), predominantly concerned with the transmission of genetic elements and their associated effects such as mutations, sterility, and other chromosome defects. When we discuss Hybrid Dysgenesis in the context of Drosophila, it generally refers to the outcome of crosses between two different lineages of fruit flies, known as 'P' (for P-element containing) and 'M' (for M-type or lacking P-elements) strains. Specifically, Hybrid Dysgenesis occurs when a Drosophila P male is crossed with an M female, leading to a series of chromosome defects in the offspring, due to the mobilization of transposable elements in the germline of the hybrid offspring.

The multiple choice question, option 4) A series of chromosome defects observed when a Drosophila P male is crossed with an M female is the correct definition of Hybrid Dysgenesis.