Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 7SQ
A gamete affected by nondisjunction could have __________.
- a. a change from the normal chromosome number
- b. one extra or one missing chromosome
- c. the potential for a genetic disorder
- d. all of the above
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Select the letter of the choice that best completes the statement. An extra chromosome can cause a defect known as trisomy 21 ora. Cooley’s anemia.b. Huntington’s disease.c. Down syndrome.d. PKU.
Colorblindness is a recessive x-linked trait. Which genotype represents a male with normal vision?
a. XNXN
b. XYN
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d. XNY
Hemophilia is a disease caused by a gene found on the X
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The recessive allele causes the disease. A man with hemophilia
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A. Illustrate using a Punnett square the probability that their children
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B. Will any of their children have the disease?
C. Predict the probabilities of their children having the disease.
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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- What is it called when chromosomes fail to separate properly during meiosis? A. Nondisjunction B. Karyotype C. Chromosomal separation failure D. Inappropriate separation E. Karyokinesisarrow_forwardHemophilia is a disease caused by a gene found on the X chromosome. Therefore, it is a sex-linked disease which is caused by the recessive allele. Suppose, a man with hemophilia marries a woman who is homozygous dominant for the trait. Predict the genotype of the man. (XH = normal; Xh= hemophiliac) * a. XH Y b. XHXh c. XhXh d. Xh Yarrow_forwardwhich is male with small testes, enlarged breasts, The genotype XXY corresponds to and decrease in body hair. a. Turner syndrome O b. Triplo-X Oc. Klinefelter syndrome d. Jacob syndromearrow_forward
- what is the likelihood that a male will inherit a sex-linked mutation on the X chromosome from his father ? A. 0% B. 25% C. 50% D. 100%arrow_forwardFor C the one above number 4 is for kleinfelter syndromearrow_forwardKlinefelter syndrome (XXY) can most be easily diagnosed by_______ . a. pedigree analysis c. karyotyping b. aneuploidy d. phenotypic treatmentarrow_forward
- A boy is color-blind (X-linked recessive) and has a straight hairline (autosomal recessive). Which could be the genotype of his mother? Select one: А. Вbxwxw B. Bbww C. Xbxbww D. Xbywwarrow_forwardwhich As a result of the abnormalities in chromosomes divergence in meiosis, there was formed the secondary oocyte, included 22 autosomes only. What disease can the baby have, after impregnation of this secondary oocyte by the normal spermatozoon? Select one: a. Klinfelter's syndrome b. Turner's syndrome c. Trisomy on the X-chromosome d. Down's syndrome e. Edward's syndromearrow_forwardOrganism X has the genotype Ccdd. How many different types of gametes can it make and in what proportion? * A. 3 Cd 1 cd B. 1 CD: 1 Cd : 1 cD 1 cd C. 1 Cc : 1 dd D. 1 Cd 1 cd A human female "carrier" who is heterozygous for the recessive, sex-linked trait hemophilia (XHXH), marries a normal male (XHY). What proportion of their male progeny will show the trait? A. 1/4 B. 1/2 C. 0 D. Allarrow_forward
- 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 overarrow_forwardBecause it is smaller in size than the x-chromosome, the Y chromosome has no functional value in determining the traits of an organism with an XX-CY sex determination system. A. True B. Falsearrow_forwardSuppose a woman has a recessive X-linked disease. Her husband doesnot have the disease. What is the chance that their second child has thedisease?a. 100% c. 25%b. 50% d. 0%arrow_forward
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