An experimental male birth control method has been developed that inhibits gonadotropin-releasing hormone (GnRH). Does this drug have the ability to prevent sperm production? Justify your answer. Indicate any potential side effects that might be of
concern to a man using this method.
What will be an ideal response?
Yes. If GnRH were inhibited, then there would be no release of FSH or LH from the pituitary. Without LH, the testes will not produce testosterone. Without testosterone, no sperm will be made. However, this may not be agreeable to the man because inhibition of testosterone interferes with sperm production and the maintenance of secondary sex characteristics.
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You are studying a population of geese in which there are two color phases, brown and gray. Color in this species is controlled by a single gene, with brown dominant to gray. A random sample of 250 geese shows that 210 are brown. What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium.)
A. 36% B. 43% C. 48% D. 57% E. 84% Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the Hardy-Weinberg principle? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Prokaryotes
A. lack a true nucleus. B. lack true DNA. C. use the cell membrane rather than ribosomes for making proteins. D. contain numerous organelles. E. are relatively benign cells incapable of harming organisms.
X chromosome inactivation results in the
a. total inactivation of both X chromosomes. b. inactivation of only the paternal X chromosome. c. inactivation of only the maternal X chromosome. d. inactivation of either the paternal X chromosome or the maternal X chromosome. e. nonrandom inactivation of X chromosomes in the initial cells of tissues.
Blood pH becomes acidic as a result of the presence of ________ ions?
Fill in the blank(s) with the appropriate word(s).