MB Chapter 8 Part 2

a bride and groom.

A pair of sex chromosomes found in a human male is most like

somatic cell Somatic is a word used to refer to the "body." These body cells are diploid and have two homologous copies of each chromosome.

An example of a cell that is 2n is a __________.

telophase II

At the end of _____ and cytokinesis there are four haploid cells.

telophase I

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

interphase.

Both mitosis and meiosis are preceded by

allows the exchange of genes between homologous chromosomes

Crossing over is important because it _____.

prophase II

During _____ a spindle forms in a haploid cell.

metaphase II

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

anaphase II

During _____ sister chromatids separate.

sister chromatids separate and migrate toward opposite poles

During anaphase II, _____.

prophase I

During which stage of meiosis do synapsis and crossing over occur?

22

How many pairs of autosomes do humans have?

5 Haploid sex cells contain half as many chromosomes as diploid somatic cells.

In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.

two ... haploid

Meiosis I produces _____ cells, each of which is _____.

four ... haploid

Meiosis II typically produces _____ cells, each of which is _____.

two diploid cells : four haploid cells In mitosis, a cell that has doubled its genetic material divides into two diploid daughter cells. In meiosis, a cell that has doubled its genetic material undergoes two rounds of division, resulting in the production of four haploid cells.

Mitosis and cytokinesis result in the formation of __________; meiosis and cytokinesis result in the formation of __________.

prophase I Synapsis, the pairing of homologous chromosomes, occurs during prophase I.

Synapsis occurs during _____.

four cells with a haploid number of chromosomes The two cell divisions of meiosis, I and II, produce four haploid daughter cells, which are not genetically identical to the diploid parent cell.

The function of meiosis is to make __________.

39

When observing a chicken skin cell in G2 under a microscope, you count 156 total chromatids. How many chromosomes does a male chicken have in its sperm cells?

its cells each have one set of chromosomes

When we say that an organism is haploid, we mean that _____.

It splits into two pairs of sister chromatids, and one pair goes to each pole of the dividing cell.

Which of the following statements correctly describes the behavior of a tetrad during anaphase I of meiosis? It splits into two pairs of sister chromatids, and one pair goes to each pole of the dividing cell. It goes intact to one pole of the dividing cell. It splits into four chromosomes, which distribute in random pairs to the two poles of the dividing cell. It splits into two pairs of homologous, nonsister chromatids, and one pair goes to each pole of the dividing cell.

Mitosis produces daughter cells with half the number of chromosomes as the parent cell.

Which of the following statements regarding mitosis and meiosis is false? Meiosis only occurs in the ovaries and testes. A normal human zygote has 46 chromosomes. Mitosis produces daughter cells with half the number of chromosomes as the parent cell. All sexual life cycles involve an alternation of diploid and haploid stages.

Crossing over is a phenomenon that creates genetic diversity during mitosis.

Which of the following statements regarding the differences between mitosis and meiosis is false? In mitosis cytokinesis occurs once, whereas in meiosis cytokinesis occurs twice. Crossing over is a phenomenon that creates genetic diversity during mitosis. Cells produced by mitosis are diploid, whereas cells produced by meiosis are haploid. In meiosis four daughter cells are produced, whereas in mitosis two daughter cells are produced.