Chapter 9

A. two chromosomes with two sister chromatids each.

A homologous pair is composed of A. two chromosomes with two sister chromatids each. B. two sister chromatids with separate centromeres. C. four chromosomes with two sister chromatids each. D. four sister chromatids, each with its own centromere. E. four sister chromatids attached at a common centromere

D. a zygote with a normal chromosome number.

A human egg with 22 chromosomes that is fertilized by a normal sperm will result in A. a zygote with trisomy. B. a zygote with disomy. C. a zygote with monosomy. D. a zygote with a normal chromosome number. E. a fertilized egg with 44 chromosomes.

A. sister chromatids have the same alleles, while nonsister chromatids have different ones.

Crossing-over between sister chromatids does not result in recombination of genetic material, while crossing-over between nonsister chromatids does because A. sister chromatids have the same alleles, while nonsister chromatids have different ones. B. sister chromatids have the same genes, while nonsister chromatids have different ones. C. sister chromatids have the same alleles but different genes, while nonsister chromatids have different alleles but the same genes. D. nonsister chromatids have the same alleles, while sister chromatids have different ones. E. nonsister chromatids have the same genes, while sister chromatids have different ones.

D. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.

During crossing-over, A. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles. B. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. C. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. D. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. E. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles.

A. meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.

In the human life cycle, A. meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual. B. mitosis produces haploid gametes, and fertilization creates a diploid cell that divides by meiosis to produce a new individual. C. diploid gametes are produced by meiosis, and fertilization produces haploid daughter cells that divide by mitosis to produce a new individual. D. diploid gametes are produced by mitosis, and fertilization results in tetrapolid daughter cells that divide by meiosis to produce a new individual. E. a haploid zygote is produced by meiosis and fertilization results in a diploid daughter cells that divide by mitosis to produce a new individual.

A. DNA is duplicated during interphase, but not during interkinesis.

Interphase differs from interkinesis because A. DNA is duplicated during interphase, but not during interkinesis. B. DNA is duplicated during interkinesis, but not during interphase. C. homologous chromosomes separate during interkinesis, but not during interphase. D. homologous chromosomes separate during interphase, but not during interkinesis. E. interkinesis only occurs during mitosis, while interphase occurs during both meiosis and mitosis.

A. meiosis I in the male parent.

Klinefelter syndrome can result from nondisjunction during meiosis I in the female parent. A. meiosis I in the male parent. B. meiosis I in either female parent. C. meiosis I or II in the male parent. D. meiosis I or II in either parent

C. 1 in 40

The chances of a woman over 40 years old having a baby with Down Syndrome is A. 1 in 800. B. 1 in 400. C. 1 in 40. D. 1 in 80. E. 1 in 21.

E. nondisjunction

The failure of sister chromatids to separate during meiosis is called A.synapsis. B. crossing-over. C. tetrad formation. D. disjunction. E. nondisjunction

D. autosomes: sex

The first 22 pairs of chromosomes are called ________ while the 23rd pair are known as the __________ chromosomes, which code for gender. A. homologous; autosomes B. autosomes; homologous C. diploid; haploid D. autosomes: sex E. sex; autosomes

A. Turner syndrome

Which of the following human syndromes is a monosomy? A. Turner syndrome B. Klinefelter syndrome C. Down syndrome D. Swyer syndrome E. Barr body syndrome

C. separation of sister chromatids - anaphase I

Which of the following is a correct match? A. separation of tetrads - anaphase II B. synapsis - metaphase I C. separation of sister chromatids - anaphase I D. synapsis - prophase II E. separation of sister chromatids - anaphase

D. keeping the chromosome number constant from one generation to the next

Which of the following is a function only of mitosis? A. organismal growth B. creating genetic variability C. reducing the chromosome number in gametes D. keeping the chromosome number constant from one generation to the next E. producing gametes

E. anaphase II and anaphase of mitosis

Which of the following phases results in separation of sister chromatids into daughter chromosomes? A. anaphase of mitosis only B. anaphase I, anaphase II, and anaphase of mitosis C. anaphase I and anaphase II D. anaphase I and anaphase of mitosis E. anaphase II and anaphase of mitosis

E. All

Which of the following processes contributes to creating genetic variability in the offspring? A. crossing-over B. independent assortment of chromosomes C. pairing of homologous chromosomes D. having different alleles of the same gene E. All of the answers describe processes that contribute to genetic variability.

A. Meiosis involves two divisions and produces four nonidentical gametes.

Which of the following statements is correct? A. Meiosis involves two divisions and produces four nonidentical gametes. B. Meiosis involves one division and produces two nonidentical gametes. C. Mitosis involves one division and produces two nonidentical gametes. D. Mitosis involves two divisions and produces four identical gametes. E. Meiosis involves two divisions and produces four identical gametes

A. The two homologous chromosomes separate into two different daughter cells.

Which statement best describes how homologous chromosomes are separated during meiosis I? A. The two homologous chromosomes separate into two different daughter cells. B. The sister chromatids of each chromosome separate into different daughter cells. C. The nonsister chromatids of each homologous pairs separate into different daughter cells. D. The two homologous chromosomes travel together into one new daughter cell. E. The two homologous chromosomes are not separated during meiosis I.