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CHAPTER 6: PRENATAL AND INFANT GROWTH Concept 6.1: The union of ovum and sperm marks the point of conception and the determination of one’s genetic inheritance. c. 1. The true onset of pregnancy occurs: a. At copulation b. At fertilization c. At implantation d. When an embryo is formed e. When the zygote is formed c. 2. The time lag between fertilization and implantation is generally several: a. Seconds b. Hours c. Days d. Weeks e. Months e. 3. About ____% of all fertilized eggs are thought to spontaneously abort during the first trimester of pregnancy: a. 10 b. 20 c. 30 d. 40 e. 50 e. 4. Approximately _______ sperm are released from the male during intercourse: a. 20 b. 2,000 c. 20,000 d. 200,000 e. 2,000,000 a. 5. Implantation of the fertilized egg occurs during the _____ week: a. First b. Second c. Third d. Fourth e. Fifth b. 6. The zygote lives off ______ _______during the first week of fetal life: a. Internal nourishment b. The yoke c. External nourishment d. The placenta
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e. Amniotic fluid d. 7. After fertilization, the two cell nuclei containing the 23 chromosomes of each parent, lie side by side for a few hours before they merge to form ______: a. A DNA molecule b. An ovum c. A monozygote d. The zygote e. A polyzygote a. 8. The zygote splits into two cells through what process? a. Mitosis b. Zygote-division c. Meiosis d. Genetic division e. Genetics Concept 6.2: Pregnancy does not begin until the zygote is implanted on the uterine wall. d. 9. The three layers of cells formed by the end of the first month of pregnancy are referred to as: a. Curly, Larry, Moe b. Zygote, embryo, fetal c. Nuclei, amnion, placenta d. Endoderm, mesoderm, ectoderm e. The "stuff of life" b. 10. Ectoderm is to _____, as mesoderm is to _____, as endoderm is to _____: a. Middle, inner, outer covering b. Outer, middle, inner covering c. Inner, outer, middle covering d. Middle, outer, inner covering e. Outer, inner, middle covering c. 11. A condition with which the infant may be born but does not refer to a specific defect:
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This note was uploaded on 07/10/2011 for the course KIN 321M taught by Professor Jensen during the Spring '11 term at University of Texas at Austin.

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