Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 8.6, Problem 1COMQ
Summary Introduction
Introduction:
Down syndrome, also called Trisomy 21 is a type of genetic disorder in which trisomy of chromosome 21 in an individual occurs. It is one of the most prominent and commonly occuring genetic disorders found in humans. Patients of Down syndrome have physical, intellectual, and mental problems.
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In a trisomic individual, such as a person with trisomy 21 (Down syndrome),a genetic imbalance occurs becausea. genes on chromosome 21 are overexpressed.b. genes on chromosome 21 are underexpressed.c. genes on the other chromosomes are overexpressed.d. genes on the other chromosomes are underexpressed.
Which is NOT a way that deletions can cause abnormal phenotypes?
A.
Haploinsufficient genes can result because too much gene product is produced.
B.
Recessive mutations may be expressed if the wild-type allele is deleted, a phenomenon called pseudodominance.
C.
If the centromere is deleted, then the whole chromosome could be lost during cell division.
D.
All of the above
1 points
You find a person that has a new allele that is not found in DNA samples taken from skin cells of the mother or the father, suggesting that the mutation arose during the formation of the gametes that formed this person. Is it more likely that the mutation was present in the sperm or the egg that formed this person and why do you believe this is the case?”
Chapter 8 Solutions
Genetics: Analysis and Principles
Ch. 8.1 - 1. A chromosome that is metacentric has its...Ch. 8.1 - Staining eukaryotic chromosomes is useful because...Ch. 8.2 - Prob. 1COMQCh. 8.3 - Which of the following statements is correct? a....Ch. 8.3 - Prob. 2COMQCh. 8.4 - 1. A paracentric inversion
a. includes the...Ch. 8.4 - Due to crossing over within an inversion loop, a...Ch. 8.4 - 3. A mechanism that may cause a translocation is...Ch. 8.5 - 1. Humans have 23 chromosomes per set. A person...Ch. 8.6 - Prob. 1COMQ
Ch. 8.6 - Prob. 2COMQCh. 8.7 - The term endopolyploidy refers to the phenomenon...Ch. 8.7 - 2. In agriculture, an advantage of triploidy in...Ch. 8.8 - Prob. 1COMQCh. 8.8 - The somatic cells of an allotetraploid contain a....Ch. 8 - 1. Which changes in chromosome structure cause a...Ch. 8 - Prob. 2CONQCh. 8 - 3. How does a chromosomal duplication occur?
Ch. 8 - 4. What is a gene family? How are gene families...Ch. 8 - Prob. 5CONQCh. 8 - Two chromosomes have the following orders for...Ch. 8 - An inversion heterozygote has the following...Ch. 8 - Prob. 8CONQCh. 8 - Explain why inversions and reciprocal...Ch. 8 - 10. An individual has the following reciprocal...Ch. 8 - A phenotypically normal individual has the...Ch. 8 - 12. Two phenotypically normal parents produce a...Ch. 8 - With regard to the segregation of centromeres, why...Ch. 8 - Prob. 14CONQCh. 8 - Prob. 15CONQCh. 8 - 16. A phenotypically abnormal individual has a...Ch. 8 - 17. A diploid fruit fly has eight chromosomes. How...Ch. 8 - Prob. 18CONQCh. 8 - Prob. 19CONQCh. 8 - 20. Aneuploidy is typically detrimental, whereas...Ch. 8 - 21. Explain how aneuploidy, deletions, and...Ch. 8 - Prob. 22CONQCh. 8 - 23. A cytogeneticist has collected tissue samples...Ch. 8 - Prob. 24CONQCh. 8 - A zookeeper has collected a male and a female...Ch. 8 - Prob. 26CONQCh. 8 - 27. What is mosaicism? How is it produced?
Ch. 8 - 28. Explain how polytene chromosomes of Drosophila...Ch. 8 - 29. Describe some of the advantages of polyploid...Ch. 8 - 30. While conducting field studies on a chain of...Ch. 8 - Prob. 31CONQCh. 8 - Which of the following terms should not be used to...Ch. 8 - Prob. 33CONQCh. 8 - Prob. 34CONQCh. 8 - A triploid plant has 18 chromosomes (i.e., 6...Ch. 8 - Prob. 36CONQCh. 8 - Prob. 37CONQCh. 8 - 38. A woman who is heterozygous, Bb, has brown...Ch. 8 - 39. What is an allodiploid? What factor determines...Ch. 8 - Prob. 40CONQCh. 8 - 41. Table 8.1 shows that Turner syndrome occurs...Ch. 8 - 42. Male honeybees, which are haploid, produce...Ch. 8 - Prob. 1EQCh. 8 - Prob. 2EQCh. 8 - With regard to the analysis of chromosome...Ch. 8 - 4. Describe how colchicine can be used to alter...Ch. 8 - 5. Describe the steps you would take to produce a...Ch. 8 - Prob. 6EQCh. 8 - What are G bands? Discuss how G bands are useful...Ch. 8 - A female fruit fly has one normal X chromosome and...Ch. 8 - Prob. 2QSDCCh. 8 - Besides the ones mentioned in this textbook, look...Ch. 8 - Prob. 4QSDCCh. 8 - 5. Discuss the importance of gene families at the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which statement about homologous chromosomes is FALSE? Select one: a. They contain the same genes in the same places along the length of the chromosome b. One member of the homologous pair came from your mother, the other from your father c. For a particular gene, one member of the pair may have one allele, while the other has a different allele d. They are joined together at the centromere as the two halves of the typical X-shaped chromosomearrow_forwardA. Give 7 genes located on X chromosomes and provide 2 protein products of each gene. B. Give 4 genes located on Y chromosomes and provide 2 protein products of each gene.arrow_forwardWhich changes in chromosome structure cause a change in thetotal amount of genetic material, and which do not?arrow_forward
- A boy with Down syndrome (trisomy 21) has 46 chromosomes. One parent and his two older sisters have a normal phenotype, but each have 45 chromosomes. a)Explain how this is possible. b)How many chromosomes do you expect to see in karyotypes of the parents? c)What term best describes this kind of chromosome abnormality? d)What is the probability the next child of this couple will have a normal phenotype and have 46 chromosomes? Explain your answer.arrow_forwardFragile X is a disorder which causes mental impairment in affected individuals. The trait which is due to a mutation in the FMR1 gene on the X chromosome is inherited in a recessive manner. An unaffected son was born to an affected man and an unaffected woman. The woman’s mother was affected while the father was normal. a. Indicate the gene notation. b. Give the genotype of the son. c. Is it possible for the couple to have an affected daughter? affected son? Derive the genotypic and phenotypic ratios for the offspring. Show and label your solutions properly. d. If the couple has four children, what is the probability that they will have three normal daughters and one normal son?arrow_forwardIn an organism’s genome, autosomes are a. the chromosomes that differ between the sexes. b. chromosomes that are involved in sex determination. c. only inherited from the mother (maternal inheritance). d. all of the chromosomes other than sex chromosomesarrow_forward
- Identical twins each carry the same genome, but over time, can develop different phenotypes. How can you explain this?arrow_forwardWhich of the following statements regarding the Y chromosome in mammals is TRUE?A. The Y chromosome is less than half the size of the X chromosome.B.Y chromosomes are most often present in egg cells and are not found in sperm cells. C.Most female mammals have one Y chromosome. D. The Y chromosome contains no protein-coding genes.arrow_forwardWhy are males more prone to having x-linked recessive disorders?a. Because the y chromosome is smaller than the x chromosome. b. Because the y chromosome is weaker than the X chromosome c. Because there is a chromosome that will inhibit the eexpression of the defective gene. d. Because there is no other chromosome that will mask the other defective chromosomearrow_forward
- Trisomy 21 is a genetic disorder that occurs when a patient has three copies of chromosome 21 in each cell. Which mutation would MOST likely result in a similar phenotype as trisomy 21?arrow_forwardConsider a couple: a woman who is homozygous for a recessive mutation that causes X-linked colorblindness, and a man with full color vision (he does not carry a copy of the mutation). a) What is the probability that a son of this couple will be colorblind? b) What is the probability that a daughter of the couple will be colorblind?arrow_forwardIf a gene is paternally imprinted, it means that: A.) it is on the X chromosome B.) it is on the Y chromosome C.) the allele inherited from the father is silenced D.) the allele inherited from the mother is silencedarrow_forward
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY