Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 15, Problem 8IQ
Summary Introduction
To explain: The reason for which sex chromosome aneuploidies have fewer deleterious effects than autosomal aneuploidies.
Introduction: A normal human cell has 23 pairs of chromosomes of which 22 pairs are the autosomes that are similar in both male and female. The 23rd pair includes the sex chromosome or allosomes that differs in males and females. Males have XY chromosomes while females have XX chromosomes. When this specific number of chromosomes is altered, the condition is known as aneuploidy.
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why Autosomal Aneuploidy Is Usually Lethal?
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Explain why autosomal aneuploidy is generally more deleterious than aneuploidy for sex chromosomes.
Chapter 15 Solutions
Study Guide for Campbell Biology
Ch. 15 - Complete the following summary of Morgans crosses...Ch. 15 - Two normal color-sighted individuals have two...Ch. 15 - In a testcross between a heterozygote tall,...Ch. 15 - With unlinked genes, an equal number of parental...Ch. 15 - The following recombination frequencies have been...Ch. 15 - a. What is the difference between an organism with...Ch. 15 - Prob. 7IQCh. 15 - Prob. 8IQCh. 15 - Mendels law of independent assortment applies to...Ch. 15 - You have found a new mutant phenotype in fruit...
Ch. 15 - Prob. 3SYKCh. 15 - Prob. 4SYKCh. 15 - Thomas Hunt Morgan firmly established the location...Ch. 15 - Prob. 2TYKCh. 15 - Sex-linked traits a. are coded for by genes...Ch. 15 - Prob. 4TYKCh. 15 - Prob. 5TYKCh. 15 - Prob. 6TYKCh. 15 - Prob. 7TYKCh. 15 - Prob. 8TYKCh. 15 - Prob. 9TYKCh. 15 - Prob. 10TYKCh. 15 - Consider three genes on the X chromosome: A, B,...Ch. 15 - Prob. 12TYKCh. 15 - Genomic imprinting a. explains cases in which the...Ch. 15 - Prob. 14TYKCh. 15 - Prob. 15TYKCh. 15 - Suppose that alleles for an X-linked character for...Ch. 15 - Some girls who fail to undergo puberty are found...Ch. 15 - Prob. 18TYKCh. 15 - The genetic event that results in Turner syndrome...Ch. 15 - Prob. 20TYKCh. 15 - Prob. 1GPCh. 15 - Prob. 2GPCh. 15 - Prob. 3GPCh. 15 - Prob. 4GPCh. 15 - Prob. 5GPCh. 15 - Red-green color blindness is caused by a...
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- Why do individuals with an excessive number of sex chromosomes often show minimum phenotypes?arrow_forwardWhy are people with balanced chromosomal translocations phenotypically normal? Do they suffer from reduced fertility? Why?arrow_forwardFor the following chromosome complements, what is the phenotypic sex of a person who has Q. XO with a copy of the SRY gene on an autosomal chromosome?arrow_forward
- Two phenotypically unaffected parents produce two children withfamilial Down syndrome. With regard to chromosomes 14 and 21,what are the chromosomal compositions of the parents?arrow_forwardTwo phenotypically unaffected parents produce two children with familial Down syndrome. Regarding chromosome 14 and 21, what are the chromosomal composition of the parents?arrow_forwardA normal mother has translocations on chromosomes 14:21. With respect to chromosomes 14:21, how many combinations of chromosomes are possible? How many gametes are viable? If the woman has children with an normal father, what is the probability that there is a daughter with Down Syndrome or a son with an unaffected phenotype?arrow_forward
- Why are the homologous regions of the X and Y chromosome important during meiosis?arrow_forwardbased on fig 1. Is this karyotype a male or female? Is there a chromosomal disorder? What type of chromosomal disorder?arrow_forwardWhy are the X and Y chromosomes not considered homologous even though they recombine at the PAR region?arrow_forward
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