Gen380SpHW_2 - Gen380:Spring 2012 Homework #2 Chapter...

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Gen380:Spring 2012 Homework #2 Chapter 2.Q#26. The amount of DNA per cell of a particular species is measured in cells found at various stages of meiosis, and the following amounts are obtained. Match the amounts of DNA on the left with the corresponding stages of the cell cycle on the right. You may use more than one stage for each amount of DNA. Stage of meiosis a. G1 b. Prophase I c. G2 d. Following telophase II and cytokinesis e. Anaphase I f. Metaphase II Amount of DNA per cell d 3.7 pg a, f 7.3 pg b, c, e 14.6 pg The amount of DNA in the cell will be doubled after the completion of S phase in the cell cycle and prior to cytokinesis in either mitosis or meiosis I. At the completion of cytokinesis following meiosis II, the amount of DNA will be halved. a. G1 occurs prior to S phase and the doubling of the amount of DNA and prior to the completion of the meiosis II and cytokinesis, which will result in a haploid cell containing one-half the amount of DNA that was contained in the cell in G1. b. During prophase I of meiosis, the amount of DNA in the cell is two times the amount in G1. The homologus chromosomes are still located within a single cell, and there are two sister chromatids per chromosome. c. G2 takes place directly after the completion of S phase, so the amount of DNA is two times the amount prior to the S phase.
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d. Following cytokinesis associated with meiosis II, each daughter cell will contain only one-half the amount of DNA of a mother cell found in G1 of interphase. By the completion of cytokinesis associated with meiosis II, both homologous pairs of chromosomes and sister chromatids have been separated into different daughter cells. Therefore, each daughter cell will contain only one-half the amount of DNA of the original cell in G1. e. During anaphase I of meiosis, the amount of DNA in the cell is two times the amount in G1. The homologus chromosomes are still located within a single cell, and there are two sister chromatids per chromosome. f. Metaphase II takes place after the cytokinesis associated with meiosis I and results in the daughter cells receiving only one-half the DNA found in their mother cell. In metaphase II of meiosis, the amount of DNA in each cell is the same as G1 because each chromosome still consists of two DNA molecules (two sister chromatids per chromosome). Chapter 2.Q#28. A cell in prophase II of meiosis contains 12 chromosomes. How many chromosomes would be present in a cell from the same organism if it were in prophase of mitosis? Prophase I of meiosis? A cell in prophase II of meiosis will contain the haploid number of chromosomes. For
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This note was uploaded on 02/09/2012 for the course GENETICES 380 taught by Professor Ohylmeyer during the Spring '11 term at Rutgers.

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Gen380SpHW_2 - Gen380:Spring 2012 Homework #2 Chapter...

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