Question

true or false

1. ____ dna replication occurs during meiosis i to create sister chromatids.
2. ____ sister chromatids are held together at a region called the centromere.
3. ____ meiosis i separates homologous chromosomes, reducing the chromosome number by half.
4. ____ after meiosis ii, the resulting cells are genetically identical haploid cells.
5. ____ spindle fibers attach to the centromeres of chromosomes to help separate them during meiosis.
6. ____ meiosis ii is responsible for separating homologous chromosomes.
7. ____ the purpose of meiosis is to produce diploid cells for growth and repair.
8. ____ the proper separation of chromosomes during meiosis is essential to prevent errors in cell division.

Explanation:

1. DNA replication occurs before meiosis I in interphase, not during meiosis I. So it's false.
2. Sister chromatids are indeed held together at the centromere. So it's true.
3. Meiosis I separates homologous chromosomes and reduces chromosome number by half. So it's true.
4. After meiosis II, the resulting cells are haploid but not genetically identical due to crossing - over and independent assortment. So it's false.
5. Spindle fibers attach to centromeres to separate chromosomes during meiosis. So it's true.
6. Meiosis I separates homologous chromosomes, meiosis II separates sister chromatids. So it's false.
7. The purpose of meiosis is to produce haploid gametes, not diploid cells for growth and repair (mitosis is for that). So it's false.
8. Proper chromosome separation in meiosis is crucial to prevent errors like aneuploidy. So it's true.

Answer:

1. False
2. True
3. True
4. False
5. True
6. False
7. False
8. True