10 Jun Mitosis & Meiosis – Crossing-over is relatively infrequently
Question
Mitosis & Meiosis
Please identify these questions as true or false.
1. Crossing-over is relatively infrequently between any two genes, but always occurs somewhere during meiosis.
2. Sister Chromatids have identical alleles.
3. Cells that divide by meiosis become haploid after the first division (meiosis I).
4. In humans, the only cells that can divide by meiosis would be found in the testes and ovaries.
5. Homologous pairs are produced when DNA replicates during S phase prior to mitosis or meiosis.
6. For a human cell, N=23, meaning that cells that have completed meiosis I have 23 chromosomes.
7. Anaphase of mitosis and anaphase of meiosis II are similar in that sister chromatids separate from each other.
8. After meiosis I, the two daughter cells are temporarily diploid.
9. A normal human cell has 46 chromosomes at every stage of meiosis.
10. Homologous chromosomes are paired only during prophase of meiosis.
11. Homologous chromosomes have the same genes.
12. A cell never divides, such as a nerve cell, is in the G1 phase of the cell cycle but can’t pass through the checkpoint into G2.
13. At the end of meiosis I, the two daughter cells produced by a dividing germ cell are haploid and genetically different.
14. A mutation would be inherited only if it occurs in the DNA of a germ cell.
15. At any given time, every cell in the human body would be in one of the four phases of the cell Cycle: G1, S, G2 or M.
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