How do spermatogenesis and oogenesis in humans differ with respect to numbers of cells produced, gamete size, and timing of the second meiotic division?

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

For which of the following is the number the same in human males and females?a. interruptions in meiotic divisionsb. functional gametes produced by meiosisc. meiotic divisions required to produce each gameted. different cell types produced by meiosis

Which statement about human reproduction is true?(A)Fertilization occurs in the vagina.(B)Spermatogenesis and oogenesis both require normal body temperature.(C)An oocyte completes meiosis after a sperm penetrates it.(D)The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.

Which statement about human reproduction is false?a. Fertilization occurs in the oviduct.b. Spermatogenesis and oogenesis require different temperatures.c. An oocyte completes meiosis after a sperm penetrates it.d. The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.

Give examples of negative and positive feedback in hormonal control of the human menstrual cycle. Why can a high estradiol level be considered a 'readiness' signal from a follicle?

Propose an experiment to test the hypothesis that cells from only one region of a frog blastula form the ectoderm. What results from this experiment would support this hypothesis?