AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many nuclear divisions take place during meiosis?
A
3
B
2
C
4
D
5
Explanation: 

Detailed explanation-1: -Finally, unlike mitosis, meiosis involves two rounds of nuclear division, not just one. Despite this fact, many of the other events of meiosis are similar to those that occur in mitosis.

Detailed explanation-2: -Two nuclear divisions occur during meiosis: meiosis I and meiosis II. Meiosis reduces chromosome number and introduces genetic variations in offsprings.

Detailed explanation-3: -Meiosis happens in the germ cells, where two nuclear divisions occur. Thus, four new cells with haploid chromosomes are formed.

Detailed explanation-4: -To accomplish this feat, meiosis, unlike mitosis, involves a single round of DNA replication followed by two rounds of cell division (Figure 1).

Detailed explanation-5: -In meiosis II, the sister chromatids separate, making haploid cells with non-duplicated chromosomes. Prophase II: Starting cells are the haploid cells made in meiosis I. Chromosomes condense. Metaphase II: Chromosomes line up at the metaphase plate. Anaphase II: Sister chromatids separate to opposite ends of the cell.

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