Quiz corrections

Question 1

Define crossing over and list the phase in which it occurs.

Answer 1

Crossing over occurs during prophase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.

Question 2

Why must sex cells first undergo meiosis before fertilization?

Answer 2

To create haploid gametes that will be used in fertilization; need to reduce the number of chromosomes to n in order to correctly yield a 2n (diploid) organism during fertilization, if not problems may occur.

Question 3

Discuss two ways meiosis contributes to genetic variation.

Answer 3

Crossing over; random lining up of chromosomes at equator.