of using amniocentesis to test for 1.One of the d genetic abnormalities is that
ID: 3447122 • Letter: O
Question
of using amniocentesis to test for 1.One of the d genetic abnormalities is that a)the results from the test are not available until the sixth week following the procedure b)the procedure itself might cause early labor contractions or c)the cost is so prohibitively high that most families do not elect to have the procedure. d)the results of the test can only be 2. A genetic counselor can provide families with all of the following EXCEPT a) The counselor is trained in grief and crisis counseling and can refer clients to therapists and support groups, as needed. b) The counselor can conduct a wide range of medical assessments, including ultrasonography, amniocentesis, and chorionic villus sampling c) The counselor can refer clients to community resources and appropriate medical specialists. d) The counselor can construct a family pedigree, which summarizes medical conditions and family relationships over at least three generations. 3. A person with one dominant healthy allele and one recessive allele for cystic fibrosis marries a person with one dominant healthy allele and one recessive allele. If they have a child, the probability of that child developing cystic fibrosis, which is a recessive gene disease, is a)75% b)1 out of4 c)50% d) 100% 4. Males are more likely to suffer from hemophilia than females are because a) males inherit the recessive alleles for hemophilia on both their X and Y chromosomes. b) the allele for the disorder comes from the child's father c) there is no dominant allele on the Y chromosome to mask the recessive allele on the X chromosome d) the allele for this condition is carried on the Y chromosome. 5. Shonda carries one dominant allele for Huntingtons disease, while Kevin has two recessive alleles for the disease. What risk do Shonda and Kevin's children have for inheriting Huntington's disease? a) It is not possible to estimate the average risk of having a child with the disease b) There is a 1 in 4 chance their children will have the disease c) One half of their children, on average, will have the disease d) All of their children will have the diseaseExplanation / Answer
1. Option b. Amniocentesis can cause early labour contractions and lead to miscarriage.
2. Option a. A genetic counsellor is not trained in grief and crisis counselling nor does s/he make referrals to any support groups.
3. Option b. There is 1 out of four ( 25%) probability that a child whose both parents are carriers for cystic fibrosis ( one healthy gene and one recessive gene) will develop Cystic fibrosis. (For cystic fibrosis to develop, both genes or alleles should be recessive/mutated.)
4. Option c. There is no dominant allele on te Y chromosome which can overpower the effects of the recessive X chromosome for this condition (This is because haemophilia is due to the mutation of the single X chromosome which comes from the mother in men. Women however inherit two X chromosomes from both the parents and absence of any proteins on one of the x Chromosomes is compensated by the other pair. This does not appen in Male offspring’s though)
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