AP BIOLOGY

HEREDITY

LINKAGE MAPPING

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If Crossing over is a tool for generating variation in the population, then what is the purpose of the S phase in the cell cycle
A
S phase is the phase in which mutations mostly occur in the DNA of the cell
B
S phase is the phase during which DNA is getting condensed to form a chromosome
C
S phase is the phase during which DNA is replicated in the cell
D
S phase is the phase during which the proteins needed for mitosis are prepared
Explanation: 

Detailed explanation-1: -Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells. Recall that the point of crossing over is to increase genetic diversity.

Detailed explanation-2: -Crossing Over This process results in new combinations of alleles in the gametes (egg or sperm) formed, which ensures genomic variation in any offspring produced.

Detailed explanation-3: -Crossing over is an enzyme-mediated process, where the exchange of genetic material between non-sister chromatids of homologous chromosomes takes place. It occurs at the pachytene stage of prophase I of meiosis.

Detailed explanation-4: -Crossing over occurs between prophase I and metaphase 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.

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