Summarize the experimental evidence that Daphnia require three cues to trigger sexual reproduction. Discuss what these cues indicate about the environment.

Peaks of LH and FSH production occur duringa. the menstrual flow phase of the uterine cycle.b. the beginning of the follicular phase of the ovarian cycle.c. the period just before ovulation.d. the secretory phase of the uterine cycle.

True or false: The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG).

An egg cell that is not fertilized follows which path?a. ovary, oviduct, uterus, cervix;b. ovary, uterus, oviduct, cervix;c. oviduct, ovary, cervix, uterus;d. oviduct, ovary, uterus, cervix;e. ovary, oviduct, cervix, uterus

During human gestation, rudiments of all organs developa. in the first trimester.b. in the second trimester.c. in the third trimester.d. during the blastocyst stage.

Which of the following is mismatched?a. urethra: sperm passage;b. testes: hormone production;c. vas deferens: semen production;d. seminiferous tubules: sperm production

Which of the following is a true statement?a. All mammals have menstrual cycles.b. The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.c. Estrous cycles are more frequent than menstrual cycles.d. Ovulation occurs before the endometrium thickens in estrous cycles.

Many frogs and mice are similar in size, yet a frog egg is vastly larger than a mouse egg. Propose a plausible explanation for this difference in the egg size.

The production of gametes .a. begins at puberty in males and females;b. requires that the testes of males produce semen;c. results in the production of diploid cells from haploid cells;d. begins at puberty in females;e. produces sperm and eggs that carry half the number of chromosomes as nongametes