• 03 SEP 18
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    10. Which chromosome is responsible for determining the sex of a human embryo?

    Write a reference for each answer

    1. Write in the appropriate name for the hormone(s) representing the reproductive biology axis below.

    MALE FEMALE

    HYPOTHALAMUS:

    PITUITARY:

    GONAD:

    2. What organ or cell represents the reproductive biology term below?

    MALE FEMALE

    GONAD: testes ovaries

    GAMETE: sperm ova

    3. MATCHING. Female reproductive cycles. Match the following terms with their description.

    A. Menstrual cycle

    B. Follicular phase

    C. Luteal phase

    D. Ovulation

    E. Estrus

    F. Proestrus

    _____ Maturation of a primordial follicle to form an oocyte/egg

    ____B_ Monthly series of events associated with maturation of an egg

    _____ Includes a “surge” of hormones from all 3 levels of the HPG axis

    _____ The result of a “surge” of hormones from all 3 levels of the HPG axis

    _____ Phase during which a female is primed to be sexually responsive

    _____ Characterized by increased progesterone levels

    4. MATCHING. Female reproductive anatomy. Match the following terms with their description.

    A. Ovary

    B. Fallopian Tube

    C. Uterus

    D. Cervix

    E. Endometrium

    F. Myometrium

    _____ Dilation of this is measured to determine the readiness for parturition

    _____ Site of implantation of developing embryo

    _____ Lining is shed during menses phase of menstrual cycle

    _____ Site of fertilization

    _____ Stimulated by oxytocin or the drug pitocin to produce uterine contractions

    _____ Site of follicles

    _____ 5. Which of the following is NOT a result of rising testosterone levels?

    A. Appearance of pubic, axillary and facial hair

    B. Deepening of the voice

    C. Luteal phase

    D. Bone growth

    E. Muscle growth

    _____ 6. During fertilization, sperm initially binds to the __.

    napelllucida

    B. acrosome

    C. coronaradiata

    D. female haplotype

    _____ 7. Which of the following genotypes would result in a normal human male?

    A. 46X

    B. 46XY

    C. 23X

    D. 23Y

    _____ 8. Which of the following could result in a baby being born with female genitalia and sexual characteristics despite having a male genotype?

    A. a mutation of the SRY gene

    B. a genetic mutation resulting in congenital adrenal hyperplasia (CAH)

    C. a 47XXY genotype

    D. a genetic mutation in an autosomal chromosome

    E. the fetus being exposed to androgens while in the mother’s womb

    _____ 9. Which of the following could result in a baby being born with male genitalia and sexual characteristics despite having a female genotype?

    A. a mutation of the SRY gene

    B. a genetic mutation resulting in congenital adrenal hyperplasia (CAH)

    C. a 47XXY genotype

    D. a genetic mutation in an autosomal chromosome

    E. the fetus being exposed to androgens while in the mother’s womb

    10. Which chromosome is responsible for determining the sex of a human embryo?

    11. One of the problems with early pregnancy tests (such as EPT) is the risk of a false negative result if the test is performed during the very early or very late stages of pregnancy. Why are these tests considered to be accurate only between 2-8 weeks after fertilization?

    12. In the article “Regulation of ovulation by human pheromones” (Stern K and McClintock MK, 1998, Nature 392:177-179), Fig 3 shows the effect of human pheromones on the length of each of the three phases of the menstrual cycle.

    A. Pheromones from donors of which phase of the cycle were demonstrated to change menstrual cycle length in recipients?

    B. During which phase of the menstrual cycle were recipients receptive to human pheromones?

    C. What was the observation that the authors state first suggested the existence of human pheromones?

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