Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
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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Males only have 1 X chromosome. This is called:
Homozygous
a.
O b. Heterozygous
Hemizygous
C.
Crossing over mixes up_____ . a. chromosomes c. zygotes b. alleles d. gametes
Nondisjunction in meiosis can result in_____ . a. base-pair substitutions c. crossing over b. aneuploidy d. pleiotropy
Chapter 20 Solutions
Human Biology Custom Edition
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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- Human sex-linked disorders in which male children are affected and female children are carriers are carried on the ________ chromosome. a. X b. 22nd c. Yarrow_forwardWhich 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_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
- During meiosis both recombinant and parental type chromatids are created. Which of the outcomes below best represents a pool of gametes from a single chromosome? A || C |||||||||||| || E |||||||||||| A. A OB.C OC. E B D оос O D.D OE. Barrow_forwardA cell that has two alleles at each locus is....? Group of answer choices a. diploid b. haploid c. homologous d. F1arrow_forwardWhen two genes are genetically “linked”, gametes produced during meiosis will usually contain allele combinations that mimic the way the alleles were placed on the parent cell’s chromosomes unless what process successfully occurs? Select one: a. Disjunction b. Self-fertilization c. Crossing over/recombination d. Aneuploidyarrow_forward
- During the observation of a baby the diagnosis of Down's syndrome was made. What is the main cause of this pathology? Select one: a. Trisomy on the 13-th chromosome. b. Trisomy on the 21-st chromosome. c. Trisomy on X chromosome. d. Monosomy on the 1-st chromosome. O e. Undivergence of sex chromosomes.arrow_forwardAlternative forms of the same gene are called _________ . a. gametes c. alleles b. homologous d. sister chromatidsarrow_forwardAny deviation in the number of chromosomes that involves individual chromosomes, as opposed to entire sets of chromosomes, is known as which one of the following?a. Aneuploidy c. Duplication b. Disomy d. Translocationarrow_forward
- In addition to codominance, the ABO blood group antigens are also an example of ________.a. incomplete dominanceb. X-linked recessive inheritancec. multiple allelesd. recessive lethal inheritancearrow_forwardSame pair of chromose that carries an identical genetic information as other a. haploid chromosome b. x chromosome c. homologous chromosome d. diploid chromosomearrow_forwardWhen one examines the pattern of inheritance of a trait and finds that it is transmitted from fathers to sons to grandsons (never appearing in the females genotype) what is the conclusion about the inheritance pattern? a. Sex linked b. Sex limited С. Sex related d. X linked e. Sex influenced Red-Green color blindness a. Has its genetic determination on the x chromosome b. Affects more males than females С. Is influenced by somatic sex differentiation d. A and b e. All of thesearrow_forward
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