Exam 10: Meiosis: the Basis of Sexual Reproduction

A) crossing over.
B) meiosis.
C) mitosis.
D) sister chromatid attachment.

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A) Diploid nuclei with unpaired chromosomes are produced from haploid parent nuclei with paired chromosomes.
B) Haploid nuclei with paired chromosomes are produced from diploid parent nuclei with unpaired chromosomes.
C) Diploid nuclei with paired chromosomes are produced from haploid parent nuclei with unpaired chromosomes.
D) Haploid nuclei with unpaired chromosomes are produced from diploid parent nuclei with paired chromosomes.

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D

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Errors in meiosis (called nondisjunction...

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A) The position where crossing over occurs is random.
B) A maternal chromosome may move toward either pole while the paternal homologue moves toward the other.
C) The pole that any one chromosome moves toward is completely independent of the movement of the other 45 chromosomes in humans.
D) The sperm that fertilizes the egg is selected at random.
E) None of the choices is correct.

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A) prophase I.
B) metaphase I.
C) anaphase II.
D) anaphase I.
E) metaphase II.

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A) Synapsis
B) Cytokinesis
C) Crossing over
D) Tetrad formation
E) Condensation of chromatin

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A) 92
B) 46
C) 184
D) 12.5
E) 23

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Most eukaryotic life cycles have three parts: (1) Sexual reproduction combines haploid gametes to form a diploid cell. (2) At some point in the life cycle, diploid cells undergo meiotic cell division to produce haploid cells. (3) Mitosis of a haploid cell, a diploid cell, or both, results in the growth of multicellular bodies.

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A) Results in producing genetically identical cells
B) Involves synapsis
C) Produces haploid cells
D) Reduces the number of chromosomes
E) Involves two divisions

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A) In asexual reproduction, the parent passes a complete set of genes to its offspring.
B) In sexual reproduction, a human offspring receives two genes for every trait.
C) In sexual reproduction, both meiosis and fertilization must occur during the life cycle.
D) Sexual reproduction puts together new combinations of genes.
E) Sexual reproduction produces clones.

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A) Germ cells
B) Sperm and egg
C) Somatic cells
D) Reduction of number of chromosomes
E) Sexual reproduction

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The random shuffling of homologous mater...

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A) In anaphase of mitosis, sister chromatids join together, but in anaphase I of meiosis, homologous chromosomes join together.
B) In anaphase of mitosis, sister chromatids separate, but in anaphase I of meiosis, homologous chromosomes separate.
C) In anaphase of mitosis, homologous chromosomes separate, but in anaphase I of meiosis, sister chromatids separate.
D) Sister chromatids do not separate in mitosis, but in anaphase I of meiosis, sister chromosomes do separate.

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A) Meiospore
B) Sperm
C) Zygote
D) Egg
E) Gametophyte

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A failure of one pair of homologous chromosomes to separate during meiosis I could have resulted in an extra chromosome 21 being incorporated into a parental gamete. Then the extra chromosome would be inherited along with the normal maternal and paternal copies of chromosome 21.