The fetus is an xxx female and is normal 6 questions

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Unformatted text preview: b.  ­  ­  ­  ­ c. +  ­ +  ­ d. +  ­ + + e. + +  ­  ­ 20. Which of the following is not an example of allostery? a. Lac repressor with Lactose b. AraC with arabinose c. CAT protein with cAMP d. rho factor with the rho utilization site e. None of the above 21. Which of the following is NOT trans ­acting element? a. Lac operator b. Lac repressor c. Ara C d. CAP e. None of the above 22. Which of the following is NOT associated with epigenetic silencing? a. Enhancers b. Histone methylation c. Genetic imprinting d. X ­inactivation e. Position effect variegation 23. The fetus of a pregnant woman is found to have no Barr bodies. Which of the following is true about the fetus? a. The fetus has a 50% chance of being a male b. The fetus is definitely a female with Turner syndrome c. The fetus is XXY and has Klinefelter’s syndrome d. The fetus is definitely a male e. The fetus is an XXX female and is normal 6 Questions 24 ­25: Shown below are restriction maps of wild type and mutant DNA from a patient. The mutation led to a change in the restriction map and was shown to be an recessive X ­linked mutation. A family came in for prenatal testing because they have an affected child. Person 1 = Mother, Person 2 = Father, Person 3 = Unborn fetus, Person 4 = Affected child. 24. Which of the following is True about the parents? a. They are both carriers of the mutation b. One is a carrier of the mutation and the other is normal c. Neither parent is a carrier of the mutation...
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