Ch 8

A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes. 1) 16 2) 8 3) 64 4) 30 5) 32

16

Normal human gametes carry _____ chromosomes. 1) 23 pairs of 2) 5 3) 23 4) 46 pairs of 5) 46

23

What name is given to this process? To view the animation, click here. Then click on the image to start the animation. A) gametogenesis B) sexual reproduction C)meiosis D) asexual reproduction E) fertilization

Asexual reproduction

Which of these gametes contains one or more recombinant chromosomes? B and C D and E A and B A and D A and C

B and C

Which of these cells is (are) haploid? 1) C and D 2) A and D 3) B and C 4) D 5) B

C and D

Which of the following is a characteristic seen in prophase I that does NOT occur in prophase II? Crossing over occurs. Chromosomes move to the middle of the cell. The number of chromosomes doubles. Spindle formation occurs.

Crossing over occurs.

The process of meiosis accomplishes which of the following? It provides eight haploid gametes and can eliminate chromosomes. It allows genetic exchange and eliminates the formation of haploid cells. It produces four haploid cells and allows exchange of genetic material between homologous chromosomes. It provides for formation of four haploid cells and reduces the need for sister chromatids.

It produces four haploid cells and allows exchange of genetic material between homologous chromosomes.

Gametes are produced by _____. 1) meiosis 2) fertilization 3) mitosis 4) the cell cycle 5) asexual reproduction

Meiosis

Which of the following statements is correct? The sperm and egg have twice as many chromosomes as the parental cells. Asexual reproduction requires the production of eggs and sperm. Meiosis results in gametes that are used in reproduction. Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division.

Meiosis results in gametes that are used in reproduction.

Sexual reproduction in humans ________. produces a haploid individual produces an individual with 23 chromosomes allows a haploid sperm cell to fertilize a haploid egg cell combines two diploid gametes, producing a zygote

allows a haploid sperm cell to fertilize a haploid egg cell

Homologous chromosomes migrate to opposite poles during _____. metaphase II anaphase I metaphase I telophase II and cytokinesis prophase II

anaphase I

This animation illustrates the events of _____. metaphase II telophase I and cytokinesis prophase II prophase I anaphase I

anaphase I

During _____ sister chromatids separate. metaphase I prophase I prophase II anaphase II interphase

anaphase II

his animation illustrates the events of _____. anaphase I anaphase II prophase II interphase telophase I and cytokinesis

anaphase II

This animation illustrates the process of _____. cytokinesis random fertilization crossing over centromere separation karyokinesis

crossing over

Meiosis II typically produces _____ cells, each of which is _____. four ... identical to the other four ... haploid two ... haploid two... diploid four ... diploid

four ... haploid

Meiosis and cytokinesis result in the formation of __________. four diploid cells four haploid cells two diploid cells two haploid cells

four haploid cells

Meiosis starts with a single diploid cell and produces two haploid cells. four haploid cells. eight haploid cells. four diploid cells. two diploid cells

four haploid cells.

During metaphase I, ______. the nuclear envelope breaks up crossing over occurs sister chromatids separate and migrate to opposite poles homologous chromosomes line up in the middle of the cell

homologous chromosomes line up in the middle of the cell

During prophase I of meiosis, the homologous chromosomes separate and move towards opposite poles. homologous chromosomes stick together in pairs. chromosome pairs are positioned in the middle of the cell. there are four haploid daughter cells. there are two daughter cells, each with 23 chromosomes.

homologous chromosomes stick together in pairs.

This animation illustrates _____. prophase II prophase I interphase anaphase II anaphase I

interphase

A cell preparing to undergo meiosis duplicates its chromosomes during anaphase I. prophase I. meiosis II. metaphase I. interphase.

interphase.

Sexual reproduction requires the cellular process of __________ followed by __________. mitosis ... gamete formation mitosis ... meiosis meiosis ... fertilization mitosis ... fertilization

meiosis ... fertilization

This animation illustrates the events of _____. prophase II metaphase I metaphase II telophase I and cytokinesis anaphase I

metaphase I

During _____ chromosomes align single file along the equator of a haploid cell. metaphase II anaphase I telophase I and cytokinesis metaphase I prophase I

metaphase II

This animation illustrates the events of _____. anaphase I interphase anaphase II prophase I metaphase II

metaphase II

One difference between mitosis and meiosis is ________. mitosis requires only one parent cell, but meiosis requires two parent cells mitosis produces cells genetically identical to the parent cell, but meiosis does not mitosis produces more daughter cells for each division than meiosis mitosis produces haploid cells, but meiosis produces diploid cells

mitosis produces cells genetically identical to the parent cell, but meiosis does not

Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions EXCEPT growth of a multicellular organism. production of sperm and eggs. cell replacement. asexual reproduction.

production of sperm and eggs.

Synapsis occurs during _____. metaphase II anaphase II prophase I prophase II telophase I and cytogenesis

prophase I

This is an animation of _____. metaphase II metaphase I telophase II and cytokinesis prophase I prophase II

prophase I

The correct order of events during meiosis is prophase I, metaphase I, anaphase I, telophase I, cytokinesis, meiosis II. prophase I, anaphase I, metaphase I, telophase I, meiosis II, cytokinesis. prophase I, anaphase I, telophase I, metaphase I, meiosis II. metaphase I, prophase I, telophase I, anaphase I, cytokinesis, meiosis II. metaphase I, prophase I, anaphase I, telophase I, cytokinesis, meiosis II.

prophase I, metaphase I, anaphase I, telophase I, cytokinesis, meiosis II.

During meiosis, segments of nonsister chromatids can trade places. This recombination of maternal and paternal genetic material is a key feature of meiosis. During what phase of meiosis does recombination occur? telophase I. anaphase I. prophase I. meiosis II. Metaphase I.

prophase I.

During _____ a spindle forms in a haploid cell. anaphase II prophase II telophase I and cytokinesis prophase I metaphase II

prophase II

This animation illustrates the events of _____. prophase I telophase II and cytokinesis anaphase II prophase II telophase I and cytokinesis

prophase II

At the end of _____ and cytokinesis, haploid cells contain chromosomes that each consist of two sister chromatids. telophase II metaphase II telophase I telophase interphase

telophase I

This animation illustrates the events of _____. prophase II and cytokinesis interphase telophase I and cytokinesis telophase II and cytokinesis telophase and cytokinesis

telophase I and cytokinesis

At the end of _____ and cytokinesis there are four haploid cells. prophase II telophase II prophase I interphase anaphase I

telophase II

This animation illustrates the events of _____. telophase II and cytokinesis telophase II telophase I telophase I and cytokinesis telophase and cytokinesis

telophase II and cytokinesis

Meiosis I produces _____ cells, each of which is _____. four ... diploid two... diploid two... identical to the other four ... haploid two ... haploid

two ... haploid