BIOLOGY
12th Edition
ISBN: 9781264839698
Author: Raven
Publisher: MCG CUSTOM
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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
Ch. 13.1 - Describe sex-linked inheritance in fruit flies.Ch. 13.1 - Prob. 2LOCh. 13.2 - Prob. 1LOCh. 13.2 - Explain the genetic consequences of dosage...Ch. 13.3 - Prob. 1LOCh. 13.4 - Prob. 1LOCh. 13.4 - Explain the relationship between frequency of...Ch. 13.4 - Prob. 3LOCh. 13.5 - Prob. 1LOCh. 13.5 - Prob. 2LO
Ch. 13.5 - Prob. 3LOCh. 13 - Inquiry question Mendel did not examine plant...Ch. 13 - What would Mendel have observed in a dihybrid...Ch. 13 - Prob. 2DACh. 13 - Why is the white-eye phenotype always observed in...Ch. 13 - In an organisms genome, autosomes are a. the...Ch. 13 - What cellular process is responsible for genetic...Ch. 13 - The map distance between two genes is determined...Ch. 13 - How many map units separate two alleles if the...Ch. 13 - How does maternal inheritance of mitochondrial...Ch. 13 - Which of the following genotypes due to...Ch. 13 - Prob. 1ACh. 13 - As real genetic distance increases, the distance...Ch. 13 - Down syndrome is the result of trisomy for...Ch. 13 - Genes that are on the same chromosome can show...Ch. 13 - The A and B genes are 10 cM apart on a chromosome....Ch. 13 - Prob. 6ACh. 13 - Color blindness is caused by a sex-linked,...Ch. 13 - Assume that the genes for seed color and seed...Ch. 13 - A low frequency of calico cats are male (about...
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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
- 2) A. Explain how polyribosomes form. B. Why might you expect the insertion of 3 DNA base pairs to be less disruptive than th deletion of a single base pair? C. Compare and contrast mitosis and meiosis with respect to their genetic outcomes? D. What are the possible consequences of non-disjunction during cell division? E. How does meiosis increase genetic diversity in populations?arrow_forward1. Your father received 23 chromosomes from his mother and 23 chromosomes from his father. How many of your paternal grandfather’s chromosomes did you receive? 2. Enlargement of the spermatogonium and oogonium can be observed in the period of maturation. True or False? 3. Why do gametes contain one of each kind of chromosome? a. Crossing over occurs during prophase I. b. Only one replication of DNA occurs during meiosis. c. The homologous chromosome separate during meiosis. d. The parental cells contain only one of each kind of chromosome. 4. In what period wherein prolonged prophase is the particular process involved? a. period of growth b. 1st reduction division c. period of multiplication d. 2nd reduction division 5. If a cell has 12 chromosomes, how many chromosomes will each of the daughter cells have after mitosis? 6. Somatic cells contain haploid number of chromosomes and undergo mitosis. True or Flase? 7. In which of the following period wherein primary ovocytes are produced?…arrow_forwardAny deviation in the number of chromosomes that involves individual chromosomes, as opposed to entire sets of chromosomes, is known as which one of the following?a. Aneuploidy c. Duplication b. Disomy d. Translocationarrow_forward
- 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
- This is a chromosomal disorder resulting from the non-disjunction of chromosome 21 during anaphase that gives an extra copy of the chromosome to the person who has inherited it.arrow_forwardYou are experimenting with a drug that interferes with spindle formation, and replicated chromosomes fail to migrate to the poles at anaphase. What type of chromosome mutation would you expect to see? A. Aneuploidy B. Chromosome deletions C. Chromosome duplications D. Chromosome translocationsarrow_forwardIn meiosis, we talk about the daughter cells having half the chromosomes of the parent cell. Choose the option that best describes what is happening to end up with half the number of chromosomes in the daughter cells. Question 8Answer a. All of the chromosomes are chemically cut in half so the daughter cells get the top or the bottom half of each of the chromosomes. b. Each daughter cell has one chromosome from each of the homologous pairs found in the parent cell. c. Each daughter cells gets a random set of chromosomes that add up to half the number of chromosomes as the parent cells had..arrow_forward
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