Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 7, Problem 10RQ
Abnormalities in the number of X chromosomes tend to be milder than the same abnormalities in autosomes because of _______.
a. deletions
b. nonbomologous recombinat ion
c. synapsis
d. X inactivation
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Abnormalities in the number of X chromosomes tend to be milder than the same abnormalities in autosomes because of ________.a. deletionsb. nonhomologous recombinationc. synapsisd. X inactivation
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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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- Using the symbols above: 1. Given: Adult diploid cell (2n = 8) 2. Show the condition of the chromosomes in the following Mitosis phases (illustrate): a. prophase b. metaphase c. anaphase d. telophase/cytokinesisarrow_forwardThe characteristic “X” shape of chromosomes is _____. a. a result of maximum compaction of the chromosome b. due to the wrapping of DNA around histones c. only evident during cell division d. indicative of a cell that is no longer dividing e. only found in the female sex chromosomearrow_forwardOccasionally, a mouse X chromosome is broken into two pieces and each piece becomes attached to a different autosome. A scientist studies this cell, and finds that the genes on only one of the two pieces undergo inactivation. By referring to the mechanism of X-chromosome inactivation, explain the observation made by the scientist.arrow_forward
- and down syndrome the victim has an extra chromosome 21. Therefore, down syndrome is a kind of ___ and results from ___. A. aneuploidy... nondisjunction of chromosome 21 during meiosis B. polyploidy... occurrence of meiosis without cytokinesis C. translocation… insertion of a transposon into chromosome 21 D. replication air… An extra cycle of DNA synthesis during the five phasearrow_forwardWhy are individuals with an extra chromosome 21, that causes Down syndrome, more numerous than individuals with an extrachromosome 3 or chromosome 16? A.] There are probably more genes on chromosome 21 than on the others B.] Chromosome 21 is a sex chromosome and chromosomes 3 and 16 are not C.] Down syndrome is not more common, just more serious D.] Extra copies of the other chromosomes are probably fatalarrow_forwardDuring crossing over,a. chromatids of homologous chromosomes exchange parts.b. mutations occur with higher than average frequency.c. chromatids of nonhomologous chromosomes exchange parts.d. nondisjunction occurs.arrow_forward
- Match each term with its description Chromatid Chromosome + Chromatin Homologous chromosomes Sister chromatids A. "Chromosome pairs inherited from each parent. Chromosomes pairs with same shape, same size and same genes. " B. One of the two identical copies making a chromosome C. Chromatids product of DNA duplication D. Single piece of chromatin tightly packed DNA with proteins E. Loosely-packed DNA with proteinsarrow_forwardThe human X and Y chromosomes a. are about the same size and have approximately the same number of genes b. include genes that determine an individual's sex c. are almost entirely homologous, despite their different names d. are both present in every somatic cell of males and females alikearrow_forwardA chromosome has the following segments, where represents the centromere. AB CDEFG What types of chromosomal mutations are required to change this chromosome into each of the following chromosomes? BE SPECIFIC WITH YOUR ANSWER! For example, if there is an inversion, specify which type of inversion AND indicate which genes are affected. a. AB CDEDEFG b. A CDEFG c. C BADEFGarrow_forward
- 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?arrow_forwardsperm of Panthera leo contains 19 chromosomes, which of the following is/are true about somatic cells? a. Panthera leo normally has 38 chromosomes in its body cells b. The Panthera leo cells normally contain 38 homologous chromosome pairs c. There are 38 sister chromatids per cell in G2 phase d. There are 76 sister chromatids per cell in G2 phase e. The somatic cell contains 38 sister chromatidsarrow_forwardA recently discovered bird species was found to have 29 chromosomes in its somatic cells before S phase. a. How many chromosomes (2n) are present in a somatic cell during mitosis? b. How many chromosomes does a bird receive from one parent? c. How many sister chromatids are present during metaphase 2? d. Assuming this species follows the same XX/XY sex differentiation as mammals, how many sex chromosomes are in an unfertilized egg?arrow_forward
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