Mastering Chapter 19 - Test 3

If a cell normally has 24 chromosomes, how many chromosomes would each of its four daughter cells have after meiosis?

12

A certain species of animal has six pairs of chromosomes. How many DNA molecules are present in the nuclei of these animals during G2 phase?

24

Which is cytokinesis and when does it occur?

Cytokinesis is the division of the cytoplasm. This process begins toward the end of mitosis and does not end until after mitosis has been completed.

When considering meiosis, when does DNA replication take place?

During interphase

During which phase of meiosis do homologous chromosomes exchange segments?

Exchange of chromosome segments occurs during prophase 1 (meiosis 1)

True or False. Mitosis takes place during M phase of the cell cycle, which is longer than inter phase.

False

Which of the following statements is accurate when referring to a cell about to begin mitosis?

Identical sister chromatids have formed and each is a newly replicated DNA double helix

During which stage of mitosis are chromosomes lined up in the center of the cell?

Metaphase

During ____________ chromosomes align single file along the equator of a haploid cell

Metaphase 2

Crossing over occurs during which stage of meiosis?

Prophase 1

During ___________ a spindle forms in a haploid cell

Prophase 2

Which of the following lists the phases of mitosis in the correct order?

Prophase, Metaphase, Anaphase, Telophase

Which stage of mitosis is characterized by the disintegration of mitotic spindles and the formation of two new nuclear membranes?

Telophase

At the end of ___________ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids

Telophase 1

At the end of _________ and cytokinesis there are four haploid cells

Telophase 2

How do mitosis and meiosis differ from each other?

The cells formed by mitosis are diploid; the cells formed by meiosis are haploid

Meiosis 2 typically produces ___ cells, each of which is ___

four; haploid

Synapsis occurs during ________

prophase 1

The purpose of meiosis is __________________

to produce haploid gametes

Meiosis 1 produces _______ cells, each of which is ___________

two ; haploid

Which of the following checkpoints does not occur late in G1?

A check that chromosome replication has been successfully completed.

Homologous chromosomes migrate to opposite poles during ____________

Anaphase 1

During _________ sister chromatids separate

Anaphase 2

During which phase of meiosis do sister chromatids separate?

anaphase 2