Design another experiment to determine whether the signalthat controls male development is a hormone. Make sureto identify your hypothesis, prediction, data collection plan,and controls
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Design another experiment to determine whether the signal
that controls male development is a hormone. Make sure
to identify your hypothesis, prediction, data collection plan,
and controls
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- . 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?Labour is controlled by the nervous and endocrine systems through a positive feedback system.In which example have we encountered another positive feedback system in Biology 30? a. Reflex loop in the PNS b. FSH levels during sperm production c. Progesterone during menstruation d. Prolactin during lactationFigure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.
- Thenumber of eggs laid by a female is called her:a.fertility.b.gonadosomatic index.c.growth form.d.rotundity.e.fecundity.Which statement about menopause is most correct? A. Menopause has to be adaptive because life-history theory predicts that women should not outlive their reproductive capacity, so menopause must have some function. B. Menopause has to be adaptive because humans, not chimpanzees, experience menopause, and humans are evolutionarily more advanced than chimps. C. Several hypotheses for menopause as an adaptation have been proposed, but more evidence is necessary to support any one of them. D. Several hypotheses for menopause as an adaptation have been proposed, but they have not been tested.Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false?a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries.b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken.c. Both progesterone and estrogen are produced by the follicles.d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.
- Select the two different ways that chemicals that might cause problems with sexual development and reproduction work - Estrogen mimics disrupt the endocrine system by attaching to molecules that except the hormone estrogen - estrogen prevents testosterone from developing. - hormone blockers keep certain hormones from attaching to their receptors. - hormone blockers help certain hormones attach to their receptors.Shown here are graphs that plot the percentage of fertilizedeggs containing males against the atmospheric temperatureduring early development in (a) snapping turtles and (b) mostlizards. Interpret these data as they relate to the effect oftemperature on sex determination.Briefly discuss the role of hormonal system in the release of bovine eggs for in vitro fertilization
- Why does continued breastfeeding decrease the chance of pregnancy? (Hint: Think about the effect the breastfeeding hormones have on estrogens and progesterone.)?Describe the effects of FGF and RA on each other in limb bud development. Give a specific example of their effects on each other in this capacity. Knowing this, propose a question/hypothesis to investigate the mechanism of how a specific morphogen controls pattern if you know that the morphogen is both necessary and sufficient AND is expressed in the correct spatial/temporal frame.Compare and contrast female choice and male choice. Explain why sometimes it is thefemale and sometimes it is the male that is choosy. Why should one sex be choosy atall? Provide examples and interpret data.