A crossover that would result in genetic recombination (e.g., Abc or aBC) could involve which chromatids?
A)1 & 2 or 3 & 4
B)1 & 3 or 2 & 4
C)1 & 4 or 2 & 3
D)1 & 3 or 1 & 4 or 2 & 3 or 2 & 4
E)any two of the four chromatids

Question

Quizplus · Accepted Answer

A crossover can occur between homologous chromosomes during meiosis which results in exchange of genetic material. This exchange happens between non-sister chromatids. Therefore, the only options that allow for this exchange are 1 & 3, 1 & 4, 2 & 3, or 2 & 4. Thus, Option D (1 & 3 or 1 & 4 or 2 & 3 or 2 & 4) is the best choice.

A Crossover That Would Result in Genetic Recombination (E