Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 15.2, Problem 3R
Summary Introduction
To review:
The reason behind the presence of fragile-X syndrome in some of the family members rather than all of them.
Introduction:
Fragile-X syndrome is a type of chromosomal abnormality that may arise from wrong meiotic division during gamete formation. It can also be inherited from the parents. The effect of this syndrome includes poor intellectual ability. One out of 3,000 males and one out of 7,000 females are affected by this disease.
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Chapter 15 Solutions
Life: The Science of Biology
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- Why do unrelated children with a disorder such as Down syndrome resemble each other more closely than they do their siblings?arrow_forwardDiscuss Hypotonia and its significance in Fragile-X and Down’s syndrome.arrow_forwarda) What is the chromosomal abnormality associated with Fragile-X Syndrome? b) What is the phenotype associated with this disorder? c) How is this trait inherited?arrow_forward
- What is a chromosomal island and how can one be identified asbeing of foreign origin?arrow_forwardHow can Cri-Du-Chat syndrome be diagnose with karyotyping?arrow_forwardGiven that the mutation causing deafness in the family shown in Figure 19–26 is very rare, what is the most probable genotype of each of the four children in generation II?arrow_forward
- A pedigree analysis was performed on the family of a man with schizophrenia. Based on the known concordance statistics, would his MZ twin be at high risk for the disease? Would the twins risk decrease if he were raised in an environment different from that of his schizophrenic brother?arrow_forwardHow does a positive ASO test for sickle-cell anemia determine that an individual is homozygous recessive for the mutation that causes sickle-cell anemia?arrow_forwardWhat is non Mendelian inheritance?arrow_forward
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