Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 13, Problem 3A
Down syndrome is the result of trisomy for chromosome 21. Why is this trisomy viable and trisomy for most other chromosomes is not?
a. Chromosome 21 is a large chromosome and excess genetic material is less harmful.
b. Chromosome 21 behaves differently in meiosis I than the other chromosomes.
c. Chromosome 21 is a small chromosome with few genes so this does less to disrupt the genome.
d. Chromosome 21 is less prone to nondisjunction than other chromosomes.
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6.) A form of “homologous recombination" can also occur in somatic cells.
a. When might this happen?
b. Describe two main differences between the recombination that occurs in meiosis and
that which happens in somatic cells. (2-3 detailed sentences.)
Same pair of chromose that carries an identical genetic information as other
a. haploid chromosome
b. x chromosome
c. homologous chromosome
d. diploid chromosome
a. What is the diploid number of chromosomes for a human?
b. What is the haploid number of chromosomes for a human?
Which cells are considered diploid, gametes or somatic cells?
C.
d. Which cells are considered haploid, gametes or somatic cells?
Chapter 13 Solutions
Biology
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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
- Genes G and H are located on chromosome 18. A woman with the genotype Gg Hh has a child with a man with the genotype GG HH. Unfortunately, the child has the genotype Ggg hhh and only survives for 6 months. When and in which parent did nondisjunction occur? Group of answer choices a. Meiosis II in the mother b. Meiosis I in the mother c. Meiosis I in the father d. Meiosis II in the fatherarrow_forwardHumans cells normally have 46 chromosomes (2n). Specify the number of chromosomes present at each of the following stages. In your answers, determine diploid or haploid number of chromosomes and the count the chromatids as chromosomes. For example: anaphase I of meiosis: 46 (2n) = 92 a. metaphase I of meiosis b. metaphase of mitosis c. telophase I of meiosis d. telophase II of meiosisarrow_forwardPossible options: A. Autopolyploidy B. Allopolyploidy C. Chromosome duplication D. Pericentric inversionarrow_forward
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- Down's syndrome, trisomy 21, is due to what likely problem during meiosis? Select one: a. Failure of the APC to add Ub to cohesins, so sister chromatids due not split correctly in anaphase II. b. DNA replication issues causing an additional third chromosome to be replicated. c. Overactive APC adding to many Ub to cohesins, so sister chromatids due not split correctly in anaphase II. d. Failure of the MPF to add Ub to cohesins, so sister chromatids due not split correctly in anaphase II.arrow_forwardWhich of the following is a FALSE statement regarding human chromosomes? A. The chromosome number in humans is 2n=46. B. Gametes have half number of the chromosomes as in somatic cells. C. There are 22 pairs of autosomes and 2 sex chromosomes. D. Liver cells can be polyploids. They can have 23, 46, 69 or 92 chromosomes.arrow_forwardWhich types of chromosome mutations a. increase the amount of genetic material in a particular chromosome? b. increase the amount of genetic material in all chromosomes? c. decrease the amount of genetic material in a particular chromosome? d. change the position of DNA sequences in a single chromosome without changing the amount of genetic material? e. move DNA from one chromosome to a nonhomologous chromosome?arrow_forward
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