Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Chapter 7, Problem 16CTQ
Individuals with trisomy 21 are more likely to survive to adulthood than individuals with trisomy 18. Based on what you know about aneuploidies from this module, what can you hypothesize about chromosomes 21 and 18?
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Individuals with trisomy 21 are more likely to surviveto adulthood than individuals with trisomy 18. Based on what you know about aneuploidies from this module, what can you hypothesize about chromosomes 21 and 18?
Individuals with trisomy 21 are more likely to survive to adulthood than individuals with trisomy 18. Based on what you know about aneuploidies (presence of an abnormal number of chromosomes in a cell) from this module, what can you hypothesize about chromosomes 21 and 18?
A meiotic-nondisjunction causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are identical, at what point during meiosis did nondisjunction take place? Explain how you arrived at this answer.
Chapter 7 Solutions
Concepts of Biology
Ch. 7 - Figure 7.2 If a mutation occurs so that a fungus...Ch. 7 - What is a likely evolutionary advantage of sexual...Ch. 7 - Which type of life cycle has both a haploid and...Ch. 7 - Which event leads to a diploid cell in a life...Ch. 7 - Meiosis produces daughter cells. a. two haploid b....Ch. 7 - At which stage of meiosis are sister chromatids...Ch. 7 - The part of meiosis that is similar to mitosis...Ch. 7 - If a muscle cell of a typical organism has 32...Ch. 7 - The genotype XXY corresponds to: a. Klinefelter...Ch. 7 - Abnormalities in the number of X chromosomes tend...
Ch. 7 - Aneuploidies are deleterious for the individual...Ch. 7 - Explain the advantage that populations of sexually...Ch. 7 - Describe the two events that are common to all...Ch. 7 - Explain how the random alignment of homologous...Ch. 7 - In what ways is meiosis II similar to and...Ch. 7 - Individuals with trisomy 21 are more likely to...
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- Assume 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_forwardVariations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.arrow_forwardIf an organism has 15 pairs of homologous chromosomes, how many chromosomes will each daughter cell have after telophase of mitosis? In this same organism, how many chromosomes will each daughter cell have after telophase II of meiosis?arrow_forward
- Why do you think that humans with trisomy chromosome 13, 18,or 21 can survive but other trisomies are lethal? Even though Xchromosomes are large, aneuploidy of this chromosome is alsotolerated. Explain why.arrow_forward. With regards to the grasshopper testes experiment, diakinesis is an ideal stage to determine chromosome number due to the degree of condensation of the chromosomes? Count the chromosomes at this stage. Does it represent a diploid or a haploid number?arrow_forwardWhy are the homologous regions of the X and Y chromosome important during meiosis?arrow_forward
- During meiosis, when crossing-over occurs between two homologous chromosomes, it does not happen at a single point, but rather two points with a stretch of DNA in between. What are the two junction points called?What is the region between the two points called and what is different about this region compared to how double-stranded DNA usually is?If the region described in b.) is located within a gene and the two homologues have different alleles of this gene, what might happen that is a direct violation of Mendel’s first law? (Describe the process with 2-3 sentences of detail.)arrow_forwardThe green-nose fly normally has six chromosomes: two metacentric and four acrocentric. A geneticist examines the chromosomes of an oddlooking green-nose fly and discovers that it has only five chromosomes; three of them are metacentric and two are acrocentric. Explain how this change in chromosome number might have taken place.arrow_forwardHow can alteration in chromosome number or structure impact living organism? Explain how Down's syndrome, Turner's Syndrome or Kleinfelter syndrome can occur? How could meiosis prodcue a gamete with 2 copies of a homologous chromosome, instead of 1 copy?arrow_forward
- With 46 chromosomes in a human diploid cell, how many chromosomes come from the person’s mother and how many from the father?arrow_forwardAssuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a cell from this organism have immediately after fertilization?arrow_forwardIn meiosis, after telophase I, do other cells (comparing one another) have the same combination of genes in each cell? Is it necessary for them to be the same?arrow_forward
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