Respuesta :
Through meiosis, an original diploid cell -germ cell- suffers reductive and non-reductive divisions, and turns into four haploid cells -gametes-.
1) B. / 2) A. / 3) A. C. / 4) A. / 5) A. B. / 6) C. / 7) D.
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Let us first review some framework about meiosis.
Through Meiosis, a diploid cell (2n) produces four haploid daughter cells (n).
Thes haploid cells are the gametes or sex cells.
After DNA replication there are two meiotic phases.
The first one is a reductive phase, in which homologous chromosomes separate.
In the second phase, the cell suffers a new, not reductive division.
1. In the first phase, Meiosis I:
- Prophase I: Chromosomes condensate and become visible. Occurs crossing-over between homologous chromosomes. Crossing-over makes the daughter cells to be genetically different from the original one.
- Metaphase I: Homologous chromosomes randomly align in the equatorial plane.
- Anaphase I: In this phase occurs the division and independent separation of homologous pairs. Each chromosome migrates to different poles. This separation generates different chromosomal combinations in the daughter cells.
- Telophase I: Chromosomes of homologous pairs are already in the corresponding poles, and the nuclear membrane forms again in each pole.
- Cytokinesis occurs. Two cells are formed
2. In the second phase, Meiosis II:
- Prophase II: Chromosomes condensate again and become visible.
- Metaphase II: Chromosomes join the spindle apparatus and migrate to the equatorial plane, where they randomly line up. Sister chromatids are holden together until they reach the Anaphase.
- Anaphase II: Centromeres divide, chromatids get separated, and each of them goes forward an opposite cellular pole.
- Telophase II: Once in the poles, the chromosomes become lax again, and the nuclear membrane forms again.
- Cytokinesis occurs. Four cells are formed
1) B. To make gametes (sperm or eggs)
2) A. Tetrads line up down the middle of the cell.
3) A. Cytokinesis is the division of the cytoplasm to form two separate
cells.
C. The two new cells produced at the end of Telophase I and
Cytokinesis are hapoid.
4) A. Tetrads do NOT form in prophase II.
5) A. Each newly forming cell gets a nucleus
B. Chromosomes uncoil to form chromatin.
6) C. 4 haploid gametes
7) D. All of the above
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