Exam 10: Meiosis and Sexual Life Cycles

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 nucleus 2. Alignment of homologous chromosomes at the metaphase plate 3. Separation of sister chromatids 4. Separation of the homologs; no uncoupling of the centromere 5. Synapsis; chromosomes moving to the middle of the cell in pairs -Which of the following best describes the frequency of crossing over in mammals?

A triploid cell contains three sets of chromosomes. If a cell of a usually diploid species with 42 chromosomes per cell is triploid, this cell would be expected to have which of the following?

The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes awry and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?

You have isolated DNA from three different cell types of an organism, determined the relative DNA content for each type, and plotted the results on the graph shown in Figure 10.3. Refer to the graph to answer the following questions. Figure 10.3 -Which sample(s) of DNA might be from a nerve cell arrested in G0 of the cell cycle?

You have isolated DNA from three different cell types of an organism, determined the relative DNA content for each type, and plotted the results on the graph shown in Figure 10.3. Refer to the graph to answer the following questions. Figure 10.3 -Which sample(s) might represent an animal cell in the G2 phase of the cell cycle?

If an organism is diploid and a certain gene found in the organism has 18 known alleles (variants), then any given organism of that species can/must have which of the following?

Use the following information to answer the next questions. There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome by excessive mutations. -A human cell containing 22 autosomes and a Y chromosome is

Which of the following is a true statement about sexual vs. asexual reproduction?

Use the following information to answer the next questions. There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome by excessive mutations. -Homologous chromosomes move toward opposite poles of a dividing cell during

For the following questions, match the key event of meiosis with the stages listed below. I. Prophase I V. Prophase II II. Metaphase I VI. Metaphase II III. Anaphase I VII. Anaphase II IV. Telophase I VIII. Telophase II -Synaptonemal complexes form or are still present.

Refer to the drawings in Figure 10.2 of a single pair of homologous chromosomes as they might appear during various stages of either mitosis or meiosis, and answer the following questions. Figure 10.2 -Which diagram represents anaphase I of meiosis?

Which of the following occurs in meiosis but not in mitosis?

Use the following information to answer the next questions. There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome by excessive mutations. -Because the rotifers develop from eggs, but asexually, what can you predict?

Refer to the drawings in Figure 10.2 of a single pair of homologous chromosomes as they might appear during various stages of either mitosis or meiosis, and answer the following questions. Figure 10.2 -Which diagram(s) represent(s) anaphase II of meiosis?

If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?

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 nucleus 2. Alignment of homologous chromosomes at the metaphase plate 3. Separation of sister chromatids 4. Separation of the homologs; no uncoupling of the centromere 5. Synapsis; chromosomes moving to the middle of the cell in pairs -Independent assortment of chromosomes occurs.

Refer to the life cycles illustrated in Figure 10.1 to answer the following questions. Figure 10.1 -In part III of Figure 10.1, the progression of events corresponds to which of the following series?

Which of these is a karyotype?

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?

A pair of homologous chromosomes includes which of the following sets of DNA strands?