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Assume that an organism exists in which crossing over does not occur, but that all other processes associated with meiosis occur normally. Consider how the absence of crossing over would affect the outcome of meiosis.If crossing over did not occur, which of the following statements about meiosis would be true?
The cell is diploid because it contains two sets of chromosomes.Only diploid cells contain two sets of chromosomes, one maternal and one paternal. Read about diploid cells.
Synapsis occurs.The pairing of homologous chromosomes that only occurs during prophase I of meiosis is called synapsis.
If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an appropriate description of its contents?
The following question refers to the essential steps in meiosis described below.1. Formation of four new nuclei, each with half the chromosomes present in the parental nucleus2. Alignment of tetrads at the metaphase plate3. Separation of sister chromatids4. Separation of the homologs; no uncoupling of the centromere5. Synapsis; chromosomes moving to the middle of the cell in pairsWhich of the steps takes place in both mitosis and meiosis?
If the DNA content of a diploid cell in the G1 phase of the cell cycle is x, then the DNA content of the same cell at metaphase of meiosis I would be
How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8 (2n = 8)?
produces offspring genetically identical to the parentOnly one individual makes a genetic contribution to the offspring.
Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.One homologous chromosome comes from the father, and the other comes from the mother. Sister chromatids are identical copies of each other.
The parent cell that enters meiosis is diploid, whereas the four daughter cells that result are haploid.Which statement correctly describes how cellular DNA content and ploidy levels change during meiosis I and meiosis II?
DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.During anaphase of both meiosis I and meiosis II, the DNA content (number of copies of chromosomes) in a cell is halved. However, the ploidy level changes only when the number of unique chromosome sets in the cell changes. This occurs only in meiosis I (where separation of homologous chromosomes decreases the ploidy level from 2n to n and produces daughter cells with a single chromosome set).
The events of prophase II are essentially the same as those of mitotic prophase except that prophase II cells are haploid.
At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids.
telophase IAt the end of telophase I and cytokinesis, there are two haploid cells with chromosomes that consist of two sister chromatids each.
anaphase IDuring anaphase I sister chromatids remain attached at their centromeres, and homologous chromosomes move to opposite poles.
metaphase IIMetaphase II is essentially the same as mitotic metaphase except that the cell is haploid.
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During anaphase I homologous chromosomes, consisting of sister chromatids, migrate to opposite poles.