23. Which of these is NOT correct concerning meiosis? In meiosis, a diploid cell

Question

23. Which of these is NOT correct concerning meiosis? In meiosis, a diploid cell undergoes two divisions Meiosis provides genetic variation through recombination between sister chromatids. to result in four haploid cells After meiosis I, the resulting cells are haploid The result of meiosis is the formation of haploid gametes. Meiosis occurs in ovaries and testes. 24. Once nerve cells become mature, they don't usually undergo cell division. Based on your knowledge of the cell cycle, you would predict that mature nerve cells become arrested in theo prophase the cell cycle hase G phase 25. Cytokinesis in animal cells involves . contraction of a ring of actin microfilaments. ,moving of centrioles to the poles forming of a cell plate the making of haploid cells E. two of these are correct. 26. Which of the following represents the sequence of events during mitosis? prophase metaphase anaphase-telophase B. interphase-metaphase- anaphase- telophase C. anaphase- telophase-metaphase- interphase D. interphase prophase metaphase telophase E. prophase-telophase-anaphase metaphase 27. An animal with a diploid number of 36 chromosomes will have 18; 18 18; 36 .36; 18 . 36;36 36; 72 28. During which of the following stages of meiosis do the sister chromatid centromeressepa chromosomes in its gametes chromosomes in its somatic cells. rate telophase II metaphase I anaphaseI metaphase II anaphase II 29. Which one of the following does NOT occur during meiosis? 7 A. Homologous chromosomes synapse Sister chromatid chromosomes move to the poles. e. Crossing-over takes place between homologous chromosomes. Chromosome number is reduced from diploid to haploid. Cells genetically identical to the parental cell are produced 30. In a cell undergoing mitosis, you observe that the chromosomes are away from the center of the cell and cytokinesis is beginning. Which phase of mitosis are you observing? metaphase anaphase D)telophase prophase 31. Which of these descriptions of interphase is NOT correct: ·Gi=growth of cell B.G2-prepare for division ( s-synthesis of RN ' E. None are correct w many sister chromatids are seen at metaphase in a mitotic cell whose diploid number is 20? 32. Ho 33. Deamination of cytosine results in a base that is now c E guanine . thymine uracil adenine tosine

Explanation / Answer

23. The answer is B. Meiosis provides genetic variation through recombinantion between sister chromatids.
The correct answer is Meiosis provides genetic variation through recombinantion between non sister chromatids.

24. The answer is D. G1 phase. - because the matured nerve cells are apperas in G1 phase only.

25. The answer is E. Two of these are correct. Those are contraction of a ring of actin microfilaments and formation of cell plate..

26. The answer is A. Prophase > Metaphase > Anaphase > Telophase.

27. The answer is B. 18 and 36. The gametes are the results of meiosis, so they have half number of chromosomes where as the somatic cells are the products of mitosis, they have the sasme chromosome number as parent cell.

28. The answer is D. Anaphase II
During Anaphase I chromosome segreagation occurs,
during Anaphase II chromatid segreagation occurs.

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