Exam 26: Reproduction and Development

Periodic pulsatile secretion of GnRH appears to be important in

Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours.This enhanced ability of the sperm to fertilize the ovum is called capacitation.In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum.These observations suggest that

The product of the SRY gene is

Hydatid mole is a type of pregnancy that,without medical intervention,frequently results in the death of the mother.The hydatid mole is thought to result most often from an abnormality in fertilization,such that the egg has two copies of paternal chromosomes,and no maternal DNA.A fetus fails to develop; instead there is rapidly growing chorionic tissue in the placenta,which secretes hCG and thus leads to a positive pregnancy test and outward signs of pregnancy.The first clue to the obstetrician that the pregnancy is abnormal is often the lack of a heartbeat in the first trimester. A.What is the genotype of the hydatid mole tissue? From the genotype alone,would most science-literate students predict that a normal embryo would form? Explain,indicating what this suggests about maternal and paternal contributions to the embryo. B.The most common cause of molar pregnancy-related maternal death is a type of cancer called choriocarcinoma,with the hydatid mole being the source and thus resembling a tumor.What characteristic of tumors leads to cancer? C.While these pregnancies often spontaneously abort,some women may elect to terminate a hydatid molar pregnancy.Is this a special case of elective abortion or is it tumor-removal? Explain.

Match the ploidy with a cell stage. -spermatogonium or oogonium

Besides sterilization,the only sure way to avoid pregnancy is ________.

During the luteal phase of the ovarian cycle,progesterone is ________ estrogen.

Match the bipotential structure with its gender-specific result. -uterus

The male gametes are called ________.

Sperm cannot fertilize an egg until they

Match the ploidy with a cell stage. -mature sperm or egg

The inability for a male to obtain or sustain an erection is called ________.

Human somatic cells contain ________ chromosomes.

Which form of contraception allows fertilization but prevents implantation?

Explain what might happen to a man taking sympathetic nervous system inhibitors to treat his hypertension,in terms of sexual function.

The male gonad is called a ________.

The ________ of the sperm contains microtubules and mitochondria.

The corpus luteum in a nonpregnant woman usually lasts about

A vasectomy prevents which of the following?

Mitotic divisions in germ cells