Exam 51: The Reproductive System

What describes placental mammalian embryos?

Ovulation occurs by a surge in the secretion of what hormone?

There are exceptions to the general rule that amphibians lay eggs that develop in the water.These exceptions show extreme variation but they do have one thing in common.What is it?

What is often -- but not always -- a feature that accompanies the evolution of internal fertilization?

In agriculture,male animals are often castrated to modify their behavior and to produce desirable qualities in the meat.What would you predict about hormone levels in castrated male animals?

Choose the letter of the best match from the following: -Sperm destruction.

-According to the figure,what is a likely day of implantation?

Some internally fertilized eggs develop and hatch outside the mother's body.What is this developmental strategy called?

What are the only mammals that lay eggs?

There are numerous fish genera that have individuals that can change their sex during their lifetime.What is this called?

Which hormone prevents the corpus luteum from degenerating?

A patient at a fertility clinic has been diagnosed with "luteal phase defect" (LPD).Her progesterone levels are low and her cycles are short.What step of reproduction are these symptoms disrupting?

Vertebrates that practice internal fertilization employ three strategies for embryonic and fetal development.In one strategy,the female retains the eggs within her body and the young are fully developed when they hatch inside of her.What is this called?

Since men produce millions of sperm,but women produce only one oocyte per cycle,in the vast majority of cases infertility is due to a problem with the woman.

Which is a correct description of hormone action?

Which of the following have young which feed on milk?

Which of the following statements is true of reptiles?

What is an important benefit of using condoms?

Major extinctions of dinosaurs are associated with large meteor impacts,including the final extinction that wiped them out at the Cretaceous-Tertiary boundary.The particulate matter that would have arisen as a result of impact would have entered the atmosphere and had secondary impacts.Some scientists believe that a fundamental difference between mammals and dinosaurs allowed mammals to survive this event,but doomed the dinosaurs.What may have characterized the last generation of dinosaurs as they went extinct?