Question

The process of crossing over between homologous chromosomes that takes place during meiosis is advantageous because it

• A. Makes for healthy offspring
• B. Provides a source of genetic variation
• C. Creates a random mix of chromosomes
• D. Allows gametes to have half the number of chromosomes
• E. Increases the number of gametes

Answer 1

Answer: (B)

Provides a source of genetic variation

Crossing over is the process of exchange of genetic material, between non-sister chromatids of homologous chromosomes, to produce new genetics combinations or variations. It produces new gene combinations neither create a random mix of chromosomes nor ensures good health of organisms. Reduction of chromosome number to half is the result of movement of the homologous chromosome to opposite poles during anaphase I of meiosis. One round of meiosis always produces 4 gametes only.

So, the correct answer is option B.