Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 20, Problem 2SQ
Summary Introduction
Introduction: Alleles are variants of a gene. Homologous chromosomes occur in pairs and one chromosome is inherited from father and the other from mother.
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The part of meiosis that is similar to mitosis is ________. a. meiosis I b. anaphase I c. meiosis II d. interkinesis
The two main sources of genetic variation from meiosis are ________.
a.
random orientation of homologous pairs and mutation
b.
crossing over and random mutation
c.
random orientation of homologous pairs and crossing over
Males only have 1 X chromosome. This is called:
Homozygous
a.
O b. Heterozygous
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Chapter 20 Solutions
Human Biology (MindTap Course List)
Ch. 20 - Prob. 1RQCh. 20 - What is a carrier of a genetic trait?Ch. 20 - What evidence indicates that a trait is coded by a...Ch. 20 - Prob. 4RQCh. 20 - Explain what nondisjunction is, and give two...Ch. 20 - _______ segregate during ______. a. Homologues;...Ch. 20 - Prob. 2SQCh. 20 - Genes on the same chromosome tend to stay together...Ch. 20 - Prob. 4SQCh. 20 - A chromosomes structure can be altered by _______....
Ch. 20 - Nondisjunction can be caused by ________. a....Ch. 20 - A gamete affected by nondisjunction could have...Ch. 20 - Genetic disorders can be caused by __________. a....Ch. 20 - A person who is a carrier for a genetic trait...Ch. 20 - Prob. 10SQCh. 20 - If a couple has six boys, what is the probability...Ch. 20 - Human sex chromosomes are XX for females and XY...Ch. 20 - People with Down syndrome have an extra copy of...Ch. 20 - Prob. 4CTCh. 20 - Prob. 5CTCh. 20 - About 4 percent of people of Northern European...Ch. 20 - The following pedigree shows the pattern of...
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- Nondisjunction in meiosis can result in_____ . a. base-pair substitutions c. crossing over b. aneuploidy d. pleiotropyarrow_forwardGenetic variation from meiosis is generated during ________. a. both meiosis I and meiosis II b. meiosis II c. meiosis Iarrow_forwardWhich of the following statements is INCORRECT? Mitosis is a conservative mechanism that preserves the genetic status quo. Meiosis is a special type of cellular division that occurs in gametes. After mitosis, two identical 2n daughter cells are produced. After meiosis I, four n daughter cells are produced. Genetic recombination or diversity is a feature of __________. A. Meiosis I C. Mitosis B. Meiosis II D. Choices A, B, and C are correct. The following are cellular events during prophase I, EXCEPT: A. Chromatin condensation C. Crossing-over B. Synapsis D. Paired homologs attach to spindle fibers. Which of the following statements refers to synapsis? It is the pairing of homologous chromosomes during meiosis. It is the alignment of chromosomes on the equatorial plate. It is the exchange of parts between non-sister chromatids. It represents the sites where crossing-over occurred. Which of the following events below…arrow_forward
- Human gametes ___ a. are produced by mitosis b. have one copy of each chromosome c. have two copies of each chromosome d. are genetically identical to every other gamete made by that person e. all of the above are truearrow_forwardThese items separate from each other during anaphase 2 of meiosis. a. Sister chromatids b. Homologous chromosome c. Genes d. The two parts of a cellarrow_forwardWhat is it called when chromosomes fail to separate properly during meiosis? A. Nondisjunction B. Karyotype C. Chromosomal separation failure D. Inappropriate separation E. Karyokinesisarrow_forward
- Which of the following meiotic events by itself does NOT result in an abnormal set of genes in a gamete? a. Translocation b. Deletion c. Nondisjunction d. Recombination e. Inversionarrow_forwardThe dividing cells shown in the picture would be in _?_ of _?_. Assume that the starting cell was diploid and it was 2n=4. A. Metaphase, mitosis B. Metaphase, meiosis I C. Metaphase, meiosis II D. Anaphase, meiosis I E. Anaphase, mitosisarrow_forwardAn individual can have an abnormal number of chromosomes as a result of nondisjunction. Identify the following example of nondisjunction that results in an abnormal number of chromosomes. A. Sister chromatids do not separate in meiosis II. B. Homologous chromosomes move apart appropriately during meiosis I. C. Mitosis occurs normally during embryonic development. D. Two normal gametes fuse during fertilization.arrow_forward
- f chromosomal nondisjunction occurs during meiosis I, what proportionof zygotes formed from the resulting gametes would be aneuploid? (Assume the gametes from the otherparent are normal) a. 0% b. 25% c. 50% d. 75% e. 100%arrow_forwardIn meiosis, DNA replicates during a. prophase I. b. both prophase I and prophase II. c. prophase II. d. interphase prior to meiosis II. e. interphase prior to meiosis I.arrow_forward_______ are chromosomes whose genes have no direct impact on the sex of an organism. a Gametes b Homologous chromosomes c Autosomes d Germ cellsarrow_forward
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