Exam 13: 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 tetrads 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 is a result of

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 tetrads 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 steps takes place in both mitosis and meiosis?

Refer to the following information and Figure 13.4 to answer the following questions. A certain (hypothetical) organism is diploid, has either blue or orange wings as the consequence of one of its genes on chromosome 12, and has either long or short antennae as the result of a second gene on chromosome 19, as shown in Figure 13.4. Figure 13.4 -A female with a paternal set of one orange and one long gene chromosome and a maternal set comprised of one blue and one short gene chromosome is expected to produce which of the following types of eggs after meiosis?

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?

Which of the following is true of a species that has a chromosome number of 2n = 16?

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. -Since the rotifers develop from eggs, but asexually, what can you predict?

In the human species, all somatic cells have 46 chromosomes. Which of the following can also be true?

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 tetrads 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?

Chromatids are separated from each other.

Independent assortment of chromosomes occurs.