BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 9.7, Problem 4MC
Summary Introduction
To explain:
The reason due to which some children are born with extra autosomes.
Introduction:
Nondisjunction is an error usually occurs during cell division. These errors can result in the production of gametes having extra or missing chromosomes. These errors can result in chromosomal abnormalities which can have a devastating effect on the health of an individual.
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Why is trisomy 21 not lethal?
Explain why the chances of survival are greater for a trisomy or monosomy of the sex chromosomes than for autosomes.
Explain why nondisjunction of sex chromosomes is more well-tolerated thannondisjunction in autosomes, even though genetic nondisjunction of sex chromosomes usually results in sterility and abnormalities of sex organs.
Chapter 9 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
Ch. 9.1 - Prob. 1MCCh. 9.1 - Prob. 2MCCh. 9.1 - Prob. 3MCCh. 9.2 - Prob. 1MCCh. 9.2 - Draw a karyotype for a cell with a diploid number...Ch. 9.2 - Prob. 3MCCh. 9.3 - Prob. 1MCCh. 9.3 - Prob. 2MCCh. 9.3 - Prob. 3MCCh. 9.3 - Prob. 4MC
Ch. 9.4 - Prob. 1MCCh. 9.4 - Prob. 2MCCh. 9.5 - Prob. 1MCCh. 9.5 - Prob. 2MCCh. 9.5 - Prob. 3MCCh. 9.6 - Prob. 1MCCh. 9.6 - In what ways are mitosis and meiosis different?Ch. 9.7 - Prob. 1MCCh. 9.7 - Prob. 2MCCh. 9.7 - Draw a diagram to show how nondisjunction of all...Ch. 9.7 - Prob. 4MCCh. 9.7 - Prob. 5MCCh. 9 - Prob. 1MCQCh. 9 - Prob. 2MCQCh. 9 - Prob. 3MCQCh. 9 - Prob. 4MCQCh. 9 - Prob. 5MCQCh. 9 - Which of the following best describes what happens...Ch. 9 - Prob. 7MCQCh. 9 - Explain why evolution often selects traits that...Ch. 9 - Prob. 2WIOCh. 9 - Sketch the relationships among mitosis, meiosis,...Ch. 9 - What is the difference between haploid and diploid...Ch. 9 - In some animals, females can reproduce by...Ch. 9 - How are mitosis and meiosis different?Ch. 9 - Prob. 7WIOCh. 9 - Prob. 8WIOCh. 9 - List some examples of chromosome abnormalities,...Ch. 9 - Some large companies in the United States cover...Ch. 9 - Prob. 1PITCh. 9 - Prob. 2PITCh. 9 - Where do the members of each pair of homologous...Ch. 9 - Review section 9.5 and the Survey the Landscape...
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- Give an explanation for why nondisjunction of sex chromosomes is extra nicely tolerated than nondisjunction in autosomes, even though genetic nondisjunction of sex chromosomes usually effects in sterility and abnormalities of intercourse organs.arrow_forwardShown below is a karyotype from a human being. How many total autosomes does this individual have? A) 2 B) 44 C) 46 D) 23arrow_forwardExplain why autosomal aneuploidy is generally more deleterious than aneuploidy for sex chromosomes.arrow_forward
- A man who is a carrier of a translocated 15/21 chromosome marries a genotypically normal woman. a. Show the possible gametes that will be formed by this man if the translocated 15/21 chromosome synapses with chromosome 21 at Prophase I.arrow_forwardExplain why a person with Klinefelter Syndrome (XXY) still exhibits abnormal phenotypes despite the fact that one of the extra X Chromosome is inactivated practically leaving an XY active sex chromosomes similar to a normal male?arrow_forwardIn 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 syndormearrow_forward
- Why are people with balanced chromosomal translocations phenotypically normal? Do they suffer from reduced fertility? Why?arrow_forwardDo none coding triplets perform any function? Give examplesarrow_forwardPhenylketonuria and alkaptonuria are both autosomal recessive diseases. If a person with PKU marries a person with AKU, what will the phenotype of their children be?arrow_forward
- Variations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.arrow_forwardAssume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?arrow_forwardFragile-X syndrome causes the most common form of inherited intellectual disability. What is the chromosomal abnormality associated with this disorder? What is the phenotype of this disorder?arrow_forward
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