EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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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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Discuss Hypotonia and its significance in Fragile-X and Down’s syndrome.
a) explain why a diagnosis of ASD is not possible in young babies.
b) Given the current understanding of the concordance of ASD, if one of the children detected in these data
was an identical twin, how certain is that the other twin would also meet the diagnostic criteria for ASD?
What advantage is there for individuals that are heterozygous for the sickle cell character?
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- Which are the Several clues suggest that Huntington disease is transmitted by a dominant allele of a single gene?arrow_forwardFemales with rr genotype are affected, males with rY are affected, females with Rr and RR are unaffected, males with RY are unaffected. a) sex-linked recessive b) autosomal dominant, homozygous lethal c) autosomal recessive d) autosomal dominantarrow_forwardIs breast and ovarian cancer linked to Mendelian transmission?arrow_forward
- Why is the chances of having a child with down's syndrome increases if the age of mother exceed forty year?arrow_forwardWhy do unrelated children with a disorder such as Down syndrome resemble each other more closely than they do their siblings?arrow_forwardHow is it possible for sickle cell trait to confer a survivalbenefit on the person who possesses it?arrow_forward
- The link between SCT and increased risk of death has been documented. Is that not enough to warrant testing, as long as a link exists? Couldn't one argue that it would instead be neglectful to NOT test for this trait since we do know that such a link exists?arrow_forward2. STATEMENT: A woman and man both do not have sickle-cell anemia, but both had one parent who had sickle cell. Sickle-cell is an autosomal (somatic) recessive trait. a) What is the genotype for the woman, man and each of their parents? b) This couple unexpectedly is going to have their first child. i. What's the probability that their child will have not have sickle cell like the couple? ii. What's the probability that the child will have sickle cell like one the grandparents?arrow_forwardWhat is the frequency of sickle cell disease (anemia)? https://ghr.nlm.nih.gov/condition/sickle-cell-disease#inheritance https://www.cdc.gov/ncbddd/sicklecell/traits.htmlarrow_forward
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