The cells marked in the photomicrograph (A) contain the enzyme 'aromatase' (B) contain the enzymes 'P450scc' and '5-alpha-reductase' (C) demonstrate receptors for follicle-stimulating hormone (D) A and B (E) B and C
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The cells marked in the photomicrograph
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- What means to retain the ability to become any cell type—including germ-line cells and gametes—when exposed to the appropriate signals in a developing embryo?What would be the external genital appearance of a mammal exposed to high levels of both androgens and estrogens during early development? What if it were exposed to low levels of both?. This experiment is an example of a research approach in which scientists infer how something works normally based on what happens when the normal process is blocked. What normal process was blocked in Jost’s experiment? From the results, what inference can you make about the role of the gonads in controlling the development of mammalian genitalia?
- A 38-year-old male is upset about his low sperm count and visits a "practitioner" who commonly advertises his miracle cures of sterility. The practitioner is a quack who treats conditions of low sperm count with megadoses of testosterone. Although his patients experience a huge surge in libido, their sperm count is even lower after hormone treatment. a) Which two glands would be responsive to the megadose of testosterone? b) Identify the two hormones that would be affected by the megadose of testosterone. Would their levels increase or decrease? c) What role, if any, would either of the affected hormones have on the man's reduced sperm count?T.S. of mammalian testis revealing seminiferous tubules show different types of cell.(i) Name the two types of cells of germinal epithelium.(ii) Name of cells scattered in connective tissue and lying between seminiferous tubules.Differentiate between them on the basis of their functions.Somites, in the embryo, give rise to muscle. Is the statement above true or false?
- Why is the cytoplasm of sperm cells very reduced? Why do mitochondria of sperm cells concentrate in the base of the flagellum?in your own words: Why are the testes located outside of the body of organisms?According to the video “The Biology of Skin Color”, how does folate deficiency affect fetal development? A. It can cause birth defects B. It helps the fetus to develop faster C. It does not affect fetal development D. It increases the health of the fetus
- What result would Jost have obtained if female development alsorequired a signal from the gonad?If a genetic female fetus is exposed to testosterone in utero, would that individual develop a complete male phenotypic sex, partial male phenotypic sex, or a normal female phenotypic sex? Explain your answer, describing the sex phenotype of the gonads, internal genital ducts and external genitalia. What would the developmental outcomes be if the fetus were instead exposed to dihydrotestosterone in utero?According to the diagram at right, FSH injections to super-stimulate the ovaries will: a. Rescue the subordinate follicles from atresia b. Reverse atresia of subordinate follicles c. Stimulate new waves of follicular growth d. Cause ovulation of atretic follicles what prevents the dominant follicles of Waves 1 and 2 from ovulating? a. follicles are not big enough b. the animal is not in heat c. the high progesterone prevents the LH/FSH surge d. all of the above e. none of the above