1) Which of the following correctly describes the formation of fraternal twins? a) A single fertilized ovum splits into two embryos. b) Two different ova are fertilized by two different sperms. c) A single zygote divides incompletely, forming twins. d) One ovum is fertilized by two sperms. 2) What causes identical twins to share the same genetic material? a) They develop from different embryos. b) They inherit DNA from different parents. c) They develop from one embryo that splits into two embryos. d) Each twin is fertilized by a different sperm. 3) Which of the following is true about fraternal twins? a) They are always of the same sex. b) They share identical DNA. c) They develop from two separate fertilized ova. d) They result from the splitting of a single embryo. 4) How do identical twins differ from fraternal twins? a) Identical twins result from two ova, while fraternal twins result from one ovum b) Identical twins are genetically identical, while fraternal twins are not. c) Identical twins are always male, while fraternal twins are always female. d) Identical twins have different placentas, while fraternal twins share one placenta. 5) Which of the following is true for fraternal twins but not for identical twins? a) They share 100% of their DNA. b) They develop from one embryo. c) They can be of different sexes. d) They are always born at different times. 6) What is a similarity between identical and fraternal twins? a) Both types always share the same placenta. b) Both types result from a single fertilized ovum. c) Both types develop in the uterus simultaneously. d) Both types are always genetically identical. 7) Which statement best describes the differences in genetic material between identical and fraternal twins? a) Identical twins have different genetic material, while fraternal twins share the same genetic material. b) Identical twins share 100% of their genetic material, while fraternal twins share approximately 50%. c) Fraternal twins share more genetic material than identical twins. d) Fraternal twins have completely different genetic material from one another. 8) If a pair of twins includes one male and one female, what type of twins are they most likely to be? a) Identical twins b) Fraternal twins c) Conjoined twins d) Mirror-image twins 9) Why are identical twins always of the same sex? a) They develop from different fertilized ova. b) They inherit different sex chromosomes from their parents. c) They share the exact same genetic material, including sex chromosomes. d) They develop from two sperms fertilizing the same ovum. 10) Which of the following scenarios can result in conjoined twins? a) Fraternal twins sharing one placenta. b) Identical twins where the embryo splits partially during early development. c) Two fertilized ova fusing during development. d) Fraternal twins sharing different amniotic sacs.

CHAPTER 15.5.1 AND 15.5.2

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