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 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?
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?
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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_forwardWhy 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_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
- The 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_forwardIdentify two ways meiosis contributes to genetic recombination? Why is it necessary to reduce the number of chromosomes in gametes? Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: Cachalot whale Egg cell Daughter cell from mitosis Daughter cell from mitosis IIarrow_forwardA 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.arrow_forward
- A certain species of animal has 18 chromosomes in its diploid cells (2n=18). Describe what the metaphase chromosome arrangement would look like for this species in each of the following stages: mitosis, meiosis I, and meiosis IIarrow_forwardA normal diploid version of a plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?arrow_forwardA diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 7 chromosomes and two gametes are found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B) Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.arrow_forward
- With two pairs of homologous chromosomes, four kinds of gametes can be produced. How many kinds of gametes can be produced with three pairs of homologous chromosomes? What does this suggest for the 23 homologous pairs of chromosomes in human cells?arrow_forwardVariations in Chromosome NumberAneuploidy Describe the process of nondisjunction and explain when it takes place during cell division.arrow_forwardHuman sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele? c. If a female is heterozygous for an X-linked allele, how many different types of gametes can she produce with respect to this allele?arrow_forward
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