If a recessive mutation occurs in a male on an X chromosome versus a Y chromosome, leading to sterility, what are the relative chances of this male passing the mutation on to his son? а. О:1 b. 1:0 c. ½:2 d. 1:1 e. None of the above

If a recessive mutation occurs in a male on an X chromosome versus a Y chromosome, leading to sterility, what are the relative chances of this male passing the mutation on to his son? а. О:1 b. 1:0 c. ½:2 d. 1:1 e. None of the above

Name: If a recessive mutation occurs in a male on an Xchromosome versus a Y
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Description: If a recessive mutation occurs in a male on an Xchromosome versus a Y chromosome, leading tosterility, what are the relative chances of this malepassing the mutation on to his son?а. О:1b. 1:0c. ½:½d. 1:1e. None of the above

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 3CT: People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes....

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. A woman with Turner syndrome is found to be colorblind (an X-linked recessive phenotype). Both her motherand her father have normal vision.a. Explain the simultaneous origin of Turner syndromeand color blindness by the abnormal behavior ofchromosomes at meiosis.b. Can your explanation distinguish whether theabnormal chromosome behavior occurred in the fatheror the mother?c. Can your explanation distinguish whether theabnormal chromosome behavior occurred at the first orsecond division of meiosis?d. Now assume that a color-blind Klinefelter man hasparents with normal vision, and answer parts a, b, and c.
A karyotype shows that a child has Klinefelter syndrome (47,XXY). If the child is also colorblind (due to a recessive X-linked allele), despite his parents having normal color vision, in which parent and stage of meiosis did nondisjunction occur? And explain why .
Describe how nondisjunction results in aneuploidy disorders, and describe the syndrome/ symptoms/ physical characteristics associated with: A) Trisomy 21, and B) your choice of the sex chromosomes (choose from X-, XXX, XXY, or XYY).
Which of the following karyotypic sex chromosome abnormalities result(s) in a male phenotype? (Select all that apply.) (a) XO (b) XXY (c) XXX (d) XYY (e) XXXY (f) XY with a complete deletion of the SRY gene
In humans, one of the genes determining color vision islocated on the X chromosome. The dominant form (C )produces normal color vision; red-green color deficiency(c) is recessive. If a man with normal color visionmarries a color-deficient woman, what is the probabilityof them having a color-deficient son? A color-deficientdaughter?
In a karyotype of a man whose wife has had several miscarriages, it was discovered that he had onlv 45 chromosomes. However, he displayed no obvious phenotypic defects. Furthermore, one of the chromosomes of pair 15 was abnormally long. Which of the following terms best describes the condition of this man? a. monosomy b,. trisomy c. tetrasomy d. translocation carrier e. edward syndorme
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%
For a certain gene in a diploid organism, eight units ofprotein product are needed for normal function. Eachwild-type allele produces five units.a. If a mutation creates a null allele, do you think thisallele will be recessive or dominant?b. What assumptions need to be made to answer part a?
An abnormality of the large intestine called intestinal polyposis (IP) is dependent on dominant gene A. A nervous disorder called Huntington’s chorea (HC) is determined by dominant gene H, a lethal gene the effects of which appear on a mean age of 40 years. A and H are on nonhomologous chromosomes. A man carrying the gene A marries a woman carrying the gene H. If this couple had 7 children, what is the chance that at least 2 of their children will survive up to old age? What are the genotypes of the man and his wife?
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Researchers discovered recently that the sole functionof the SRY protein is to activate an autosomal genecalled Sox9 in the presumptive gonad (before it has“decided” to become a testis or an ovary).a. What would be the sex of an XY individual homozygous for nonfunctional mutant alleles of Sox9?Explain.b. Given your answer to part (a), why is SRY, ratherthan Sox9, considered the male determining factor?(Hint: What do you think would happen if you didan experiment like the one in the Fast Forward BoxTransgenic Mice Prove That SRY Is the MalenessFactor, except that you used a Sox9 transgeneinstead of SRY?)