SOLVED

31. John (a boy) and Jill (a girl) claim that they are twins. You would know for certain that: a. if they are twins, they are monozygotic twins b. if they are twins, they are dizygotic twins c. if they are twins, John was born first and Jill was born second d. they could not possibly be twins 32. Jane and Jill are monozygotic twins. Therefore, they: a. share the same physical traits b. are no more alike than any other two siblings c. developed from two separate ova fertilized by two separate sperm d. have been raised in different environments 3 Tom and Forrest are dizygotic twins. Therefore, they: a. share the same physical traits b. resulted from the division of a single fertilized ovum c. are no more alike genetically than any other two siblings d. have been raised in different environments 34. When a woman becomes pregnant from the fertilization of two separate ova by two separate sperm, these twins are called _________ twins: a. dizygotic b. monozygotic c. identical d. nonfraternal 35. Which of the following statements regarding fraternal twins is FALSE? a. They are produced when two ova are released and each unites with a sperm. b. They may be of the same or opposite sex. c. The twins develop from the same zygote. d. The genetic traits of the two twins can be as different or as similar as those of any other two siblings. 36. Suppose that Maddie has difficulty becoming pregnant and decides to use reproductive technologies to increase her chances of having a baby. According to the text, one side effect of this technology that she should be aware of is that it: a. increases the risk of miscarriage b. increases her chances of getting a divorce c. increases her chances of having twins d. increases her likelihood of experiencing postpartum depression 37. Which of the following develops from the embryonic disk? a. the placenta b. the baby c. the amniotic sac d. the amniotic fluid 38. Which of the following structures is most similar in function to a filtering system in the engine of a car that moves gas from the gas tank, filters impurities out of it, and delivers it to the carburetor? a. the amniotic fluid b. the amniotic sac c. the placenta d. the embryonic disk 39. A fluid-filled membrane that encloses the developing embryo or fetus is called the: a. amniotic sac b. embryonic disk c. fallopian tube d. placenta 40. The disk-shaped structure that nourishes the embryo and fetus is called the: a. amniotic sac b. umbilical disk c. embryonic disk d. placenta