Exam 13: Meiosis and Sexual Life Cycles

Refer to the drawings in Figure 13.2 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 13.2 -Which diagram represents anaphase I of meiosis?

Which of the following happens at the conclusion of meiosis I?

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?

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

Homologous chromosomes move toward opposite poles of a dividing cell during

When does the synaptonemal complex disappear?

A given organism has 46 chromosomes in its karyotype. We can therefore conclude which of the following?

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 -How does the sexual life cycle increase the genetic variation in a species?

Refer to the life cycles illustrated in Figure 13.1 to answer the following questions. Figure 13.1 -Which of the life cycles is typical for most fungi and some protists?

Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesins. Such molecules must have which of the following properties?

A cell divides to produce two daughter cells that are genetically different.

Which of the following is an example of alternation of generations?

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 13.3. Refer to the graph to answer the following questions. Figure 13.3 -Which sample might represent a zygote?

The human genome is minimally contained in which of the following?

A karyotype results from which of the following?

Which of the following defines a genome?

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 -If a female of this species has one chromosome 12 with a blue gene and another chromosome 12 with an orange gene, and has both number 19 chromosomes with short genes, she will produce which of the following egg types?

Referring to a plant's sexual life cycle, which of the following terms describes the process that leads directly to the formation of gametes?

The human X and Y chromosomes

Which of the following best describes a karyotype?