Exam 42: Animal Reproduction

When examining histological sections derived from the testes of male mammals, you come across cells that are near the lumen of the seminiferous tubules and connected by cytoplasmic bridges.Which cells have you found?

Refer to the figure depicting the average blood concentrations of four circulating hormones in 100 healthy adult women.Each hormone plays a role in regulating some aspect of the ovarian and/or uterine cycle. Based on the figure, which statement is true?

Blocks to polyspermy serve to

Mammalian spermatocytes remain in cytoplasmic contact throughout their development

Which cells would be found closest to the basement membrane of a seminiferous tubule?

While examining histological sections derived from the ovaries of human females at various life stages, you come across a slide labeled "Section of an ovary from a mature female." You would expect to find all of these cells on the slide except for a(n)

In humans, a primary oocyte is _______ and arrested in _______ of meiosis.

A spontaneous abortion, commonly called a(n) _______, may result from a chromosomal abnormality in the embryo or from a problem in the process of implantation.

Which statement characterizes therians?

Secondary sexual characteristics

Mifepristone (formerly called RU-486) terminates a pregnancy by blocking the action of progesterone.The termination occurs because progesterone is needed to

If a man carries a genetic mutation that prevents the maintenance of cytoplasmic bridges between his secondary spermatocytes and his spermatids, would you expect that he would father only sons or only daughters? Explain your answer.

A vasectomy is a relatively minor operation in which the _______ is/are cut and the loose ends are tied off.

The uterus opens into the vagina at a muscular necklike region called the _______.

During the evening hours you observe two salamanders in a pool, one is leading the other as if in a dance.It appears to be a mating ritual.At the conclusion of the ritual, you do not see any eggs in the water.Several days later you return and find a clutch of salamander eggs developing in the pool.What is a likely explanation for these observations?

Several days after her due date, a pregnant woman comes to the hospital in labor, but after a period of time, her labor contractions cease.Her physician administers Pitocin, a manufactured form of _______, which causes labor to resume.

Choose the correct pairing between cell type and ploidy.

Which would be an expected outcome of removal of the prostate gland?

Refer to the figure showing aphid reproductive cycles. The organism labeled 1 is a female and is genetically identical to the organism(s) labeled _______.

In oogenesis, the first meiotic division produces