Exam 27: Reproduction and Embryonic Development

Cells migrate from one place to another during gastrulation using

In this graph of estrogen and progesterone in the female reproductive cycle, the center dotted line represents day 14. Which of these is true?

Reproductive systems with external fertilization are most common in

Which statement regarding spermatogenesis and oogenesis is true?

When does the human blastocyst implant in the wall of the uterus?

When a chemical signal from a group of embryonic cells causes a different, nearby group of cells to embark on a particular developmental course (say, differentiating into a leg), the interaction between the two groups of cells is called

Two important contributions that cleavage makes to development are to

-In which part of the human female reproductive system would an IUD be placed?

Which process is most similar to the process of cleavage?

The discovery of ________ explains embryonic pattern formation in a wide variety of organisms.

If a woman has reached or passed her due date (the date that a woman is expected to give birth), her obstetrician may use hormones to help initiate labor. Which of the following hormones would assist the most in the initiation of labor?

Sterilization, in which sperm are surgically prevented from reaching the egg, is accomplished by

-In which part of the human female reproductive system would a spermicide be placed?

The human egg is swept through the oviduct toward the uterus by

Brittany's family includes several individuals with a genetic disorder that affects primarily males. Her husband Tony has no history of the disease. They have decided that their best chance to have a healthy family is to have only daughters. Through a new type of assisted reproductive technology, it is possible to separate sperm that will produce sons from those that will produce daughters. Brittany's eggs will be fertilized by in vitro fertilization (IVF) with sperm that can produce only daughters. The developing female embryo can be implanted into her uterus to complete development normally. -The daughter-producing sperm used to fertilize Brittany's eggs should be

The brain and spinal cord are formed from the

Which process occurs during labor?

Which agent can cause an infection that can ultimately develop into pelvic inflammatory disease in women?

Home pregnancy test kits can detect whether a woman is pregnant within 1 to 3 weeks of her egg being fertilized. The test kits include a short strip of paper that extends from a plastic case. After a woman urinates on the strip of paper and waits 3 to 5 minutes, a symbol is displayed on a small window in the plastic case. Some tests show a single line to indicate the woman is not pregnant (negative result) and two lines to indicate she is pregnant (positive result). Others show a minus or plus sign (or some other variation) to indicate negative and positive results. The test reports a positive symbol if it detects the presence of HCG in the woman's urine. In order for HCG to be detected, it must be present in the urine at a concentration of at least 10 to 100 units per milliliter. Even though home pregnancy tests are well designed and have been tested extensively, false negative and false positive results do occur. A false positive occurs when a test tells a woman that she is pregnant when she really is not, and a false negative occurs when a test tells a woman that she is not pregnant when she really is. Most home pregnancy test kit manufacturers claim that their tests are over 99% accurate. -What would be the best experiment for a manufacturer to conduct in order to determine the false negative rate of its test kits?

Hermaphrodites are animals that