Bio. Chapter 10

25 July 2022
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question
Centromeres divide in A) mitosis and meiosis I. B) mitosis and meiosis II. C) meiosis II only. D) meiosis I and meiosis II. E) mitosis, meiosis I and meiosis II.
answer
B) mitosis and meiosis II.
question
Which of the following describes meiosis II in humans? A) 4N -> 2N B) 2N -> 2N C) 2N -> 1N D) 1N -> 2N E) 1N -> 1N
answer
E) 1N -> 1N
question
Arrange the following events in the proper order in which they occur during meiosis I. 1 = Separation of homologous chromosomes 2 = Synapsis 3 = Crossing-over 4 = Independent assortment A) 1, 2, 3, 4 B) 1, 3, 2, 4 C) 2, 3, 1, 4 D) 2, 3, 4, 1 E) 2, 4, 3, 1
answer
D) 2, 3, 4, 1
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Germ-line cells are haploid but gametes are diploid. A) True B) False
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B) False
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Independent assortment occurs in prophase I. A) True B) False
answer
B) False
question
Which of the following features are unique to meiosis? A) synapsis B) homologous recombination C) reduction division D) A and B E) A, B and C
answer
E) A, B and C
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A crossover in meiosis is an exchange of genetic material between A) sister chromatids of the same chromosome. B) sister chromatids of homologous chromosomes. C) sister chromatids of non-homologous chromosomes. D) non-sister chromatids of homologous chromosomes. E) non-sister chromatids of non-homologous chromosomes.
answer
D) non-sister chromatids of homologous chromosomes.
question
The four daughter cells produced in meiosis A) are diploid just like the parent cell. B) have double the number of chromosomes as the parent cell. C) have one-fourth the number of chromosomes of the parent cell. D) have one of each pair of chromosomes found in the parent cell. E) have identical chromosomes.
answer
D) have one of each pair of chromosomes found in the parent cell.
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Crossing-over occurs in meiosis I and meiosis II. A) True B) False
answer
B) False
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Chromosome duplication occurs between meiosis I and meiosis II. A) True B) False
answer
B) False
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Human cells have 46 chromosomes. At the end of Metaphase I, how many chromosomes are present in one cell?
answer
46
question
Consider a cell that has four pairs of chromosomes. What is the number of possible chromosome orientations in that cell?
answer
16
question
Random orientation of homologous chromosomes occurs in ________ of meiosis.
answer
metaphase I
question
Which characteristics are similar for mitosis and meiosis?
answer
One duplication of chromosomes
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Which characteristics are unique to meiosis?
answer
Two divisions of chromosomes, pairing of homologous chromosomes, exchange of genetic material by crossing over
question
After telophase II and cytokinesis, how many chromosomes are present in one human cell?
answer
23
question
Humans have 46 chromosomes; how many homologous pairs does that represent?
answer
23