Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 5PDQ
What explanation has been proposed to explain why Down syndrome is more often the result of nondisjunction during oogenesis rather than during spermatogenesis?
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Briefly describe nondisjunction in meiosis and identify several potential consequences. In other words, what are the possible outcomes?
1) A variety of abnormalities in the numbers of sex chromosomes exist because of nondisjunction during gametogenesis. Discuss the signs and problems associated with conditions such as Klinefelter and Turner syndromes.
What is Down's syndrome? Give its symptoms and cause. Why is it that
the chances of having a child with Down's syndrome increases if the age
of the mother exceeds forty years?
Chapter 6 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 6 - CASE STUDY| Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales
Aquatic vegetation...Ch. 6 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 6 -
CONCEPT QUESTION
2. Review the Chapter Concepts...Ch. 6 -
3. Define these pairs of terms, and distinguish...Ch. 6 -
4. For a species with a diploid number of 18,...Ch. 6 - What explanation has been proposed to explain why...Ch. 6 - Contrast the fertility of an allotetraploid with...Ch. 6 -
7. Why do human monosomies most often fail to...
Ch. 6 -
8. Describe the origin of cultivated American...Ch. 6 - Predict how the synaptic configurations of...Ch. 6 - Inversions are said to “suppress crossing over.”...Ch. 6 -
11. Predict the genetic composition of gametes...Ch. 6 - Human adult hemoglobin is a tetramer containing...Ch. 6 -
13. The primrose, Primula kewensis, has 36...Ch. 6 - Certain varieties of chrysanthemums contain 18,...Ch. 6 - Drosophila may be monosomic for chromosome 4, yet...Ch. 6 - Mendelian ratios are modified in crosses involving...Ch. 6 -
17. Having correctly established the F2 ratio in...Ch. 6 -
18. In a cross between two varieties of corn,...Ch. 6 -
19. A couple planning their family are aware that...Ch. 6 -
20. A woman who sought genetic counseling is...Ch. 6 - The woman in Problem 20 has had two miscarriages....Ch. 6 -
22. In a recent cytogenetic study on 1021 cases...Ch. 6 -
23. A boy with Klinefelter syndrome (47,XXY) is...Ch. 6 - In a human genetic study, a family with five...Ch. 6 - A 3-year-old child exhibited some early indication...Ch. 6 - A normal female is discovered with 45 chromosomes,...
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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
- Give the chromosomal constitution & related sex in each of the following :-i) Turner syndromeii) Klinefilter syndromearrow_forwarda) Define Disorders of Sex Development (DSD). b) Explain why gene mutations affecting gonad development may lead to DSD conditions. c) What is sex-chromosome mosaicism? When and how may this mosaicism arise?arrow_forwardWhich is the type ofgamete produced by aheterozygous individual?What is the genotypicalproportion of these gametes?arrow_forward
- Why do most cases of Down syndrome originate from the mother? And how is this linked to maternal age ?arrow_forwardWhat are the Consequences of Inversions during Gamete Formation ?arrow_forwardName the technique by which one can disorder any possible chromosomal ormetabolic disorders in foetus.arrow_forward
- With reference to sex determination in humans, discuss: i) X chromosome inactivation; and ii) Testicular feminizationarrow_forwardWhat are the non-random events that occur during sexual reproduction (post-meiosis) in humans? Please be specific on naming the events.arrow_forwardPlease explain Androgen Insensitivity Syndrome (ALS). What is the phenotype of these individuals? What is their chromosomal makeup?Why does this disorder occur?arrow_forward
- With relevance to sex determination in humans, discuss: i) X chromosome inactivation; and ii) Testicular feminization Provide detail examples.arrow_forwarda. If cell division during gametogenesis is non-meiotic, what is its consequence to the future generations of diploid organisms? b. How does non-disjunction in meiosis lead to numerical chromosomal aberration?arrow_forwardDescribe how nondisjunction in human female gametes can give rise to Klinefelter and Turner syndrome offspring following fertilization by a normal male gamete.arrow_forward
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