1. A father has an x-linked recessive disease. The mother does not have the disease and is not a carrier. What is the likelihood of their children inheriting this disease? a.There is a 50% chance that each child will inherit the disease. b.There is a 25% chance that each child will inherit the disease. c.All male children will inherit the disease. d.All female children will be carriers of the disease. 2. What is the expected expression of a monogenic or Mendelian trait that has its locus (location) on the Y chromosome? a.Females never inherit the trait. b.Females inheriting the trait will be carriers. c.Males inherit the trait in a dominant pattern of expression; females inherit the trait in a recessive pattern of expression. d.Females inherit the trait in a dominant pattern of expression; males inherit the trait in a recessive pattern of expression. 3. The most common chromosomal abnormality among live-born infants is: a.Angelman Syndrome b.Patau Syndrome c.Down Syndrome d.Prader-Willi Syndrome 4. All diseases have multifactorial inheritance. True False 5. Newborn screening reveals that a baby is positive for a gene mutation causing a genetic disorder. How should the nurse help the parents interpret this finding? a.“The finding is probably incorrect.” b.“There are many good treatments for this disease today.” c.“These things come back positive all the time, so don’t worry.” d.“Screening only indicates that more specific testing should be done.”
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Q.5. The gene for a certain sex-linked trait is found only on the Y chromosome the male parent carries this gene, which of the following statements about the inheritance of that trait is true? a. The trait will be expressed in 100 percent of the female offspring. b. The trait will be expressed in 50 percent of the female offspring. C. The trait will be expressed in 100 percent of the male offspring. d. The trait will be expressed in 50 percent of the male offspring. Q.6. During translocation, a. pieces of DNA are exchanged between the non-sister chromatids of a homologous pair. b. a segment of DNA is broken off of a chromosome and reattached to the same chromosome, but backward in orientation. c. segments of DNA involved in crossing-over undergo somatic mutations. d. a segment of DNA breaks off one chromosome and is attached to a nonhomologous chromosome. Q.7. Down syndrome results from trisomy of chromosome 21. Which of the following is not an example of how this may have happened? a. translocation of chromosome 21 b. failure of the homologous pair for chromosome 21 to separate in meiosis c. inversion of a portion of chromosome 21 during S phase d. failure of the sister chromatids in a duplicated chromosome 21 to separate in meiosis Q.8. Which of the following is true regarding understanding the results of genetic testing? a. If the test shows that you have the allele for a genetic disorder, you will, eventually, show symptoms of that disorder. b. If the test shows that you have the allele for a genetic disorder, you may be able to reduce your risk of developing that disorder with lifestyle changes. c. If the test shows that you do not carry the allele for a particular disorder, there is no chance that you will get that disorder. d. Because we know the functions of all the genes in the human genome, genetic tests can give you complete and accurate information regarding your medical health.
James K.
1. The heterogametic sex is represented as: Select one: a. XX b. XO c. OY d. XY 2. Which of the following is an example of epistasis? Select one: a. ABO blood typing b. Bombay blood phenotype c. Pink flower color in snapdragons d. Marfan's syndrome 3. Phocomelia and thalidomide exposure are an example of: Select one: a. pleiomorphic disease b. epistasis c. phenocopy d. codominance 4. A trait that often skips generations can be classified as: Select one: a. autosomal dominant b. autosomal recessive c. Y-linked dominant d. codominant 5. Completely shaded circles in pedigrees represent: Select one: a. normal males b. normal females c. affected males d. affected females 6. A female affected by an X-linked recessive disorder has a son. Her son: Select one: a. is unaffected b. is a carrier of the disorder c. is affected by this disorder d. you need whole genome sequencing to determine whether he is affected or not 7. Which of the following statements regarding mitochondrial disorders is true? Select one: a. They can be passed on from fathers to sons. b. They can be passed on from mothers to daughters. c. They can be passed on from both parents to all children. d. They can be passed from fathers to daughters. 8. The expected ratio of phenotypes in the F2 generation of a dihybrid cross is: Select one: a. 1:2:1 b. 9:3:3:1 c. 3:1 d. none of the above 9. In Mendel's MONOHYBRID pea plant experiments, he observed: Select one: a. tall was a recessive trait b. the phenotypic ratio of the F2 progeny was 9:3:3:1 c. the transmission of one trait d. heterozygous dominant plants always displayed the recessive phenotype 10. Multifactorial traits are: Select one: a. controlled by the expression of one gene only b. controlled typically by the expression of several genes c. controlled by the environment d. controlled typically by the expression of one or more genes and the environment
Madhur L.
(6) A family has four boys and has opted to try one more time for a daughter. A friend of the family has told them that since they have had so many boys already, there would be only a 1/16 (0.5 x 0.5 x 0.5 x 0.5) chance of having a boy again but a 15/16 chance of having a daughter now. Is this a reasonable or correct assessment? Please provide your own analysis of this situation. (7) A family pedigree for a trait shows a fatal disorder cropping up in members of a family in both sexes and in every generation, but, surprisingly, it also shows that unrelated husbands and wives marrying into this family are also equally prone to dying of this disorder. What are 2 possible interpretations of this observation concerning the origins and etiology of this deadly disorder? (8) What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive individual will exhibit the dominant phenotype? Explain your answer. (9) What is Huntington's disease? How is it inherited? Why do you suppose that the longer the CAG repeat mutation is in the disease's gene, the more severe the disease and the earlier the onset of the disease? (10) In a well-constructed short paragraph, discuss some of the legal and ethical issues surrounding genetic testing and other modern human genetic advances.
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