Exam 27: Reproduction and Embryonic Development

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 positive rate of its test kits?

Which statement about the reproductive system of human females is true?

-In which part of the human female reproductive system does implantation normally take place?

Research indicates that ________ respond(s) to ________ signals that inform a cell about its position relative to other cells in the embryo.

An advantage of human testes being positioned in an external sac rather than in the abdominal cavity is that the

Which statement regarding sexual reproduction is true?

Which of the following STIs is caused by a virus that can also cause cancer?

In a study of patients seeking assisted reproductive technology, researchers examined the level of FSH in each patient as well as the average number of oocytes they were able to retrieve. Here is an approximation of the data. Older than 33 but Older than 38 but Younger than 33 younger than 37 younger than 41 Older than 41 FSH levels paseline =100\% 112\% 117\% 122\% Oocytes retrieved 8.8 7.5 4.7 3.2 Source: Adapted from Barad, D. H., Weghofer, A., and Gleicher, N. (2007). Age-specific levels for basal follicle-stimulating hormone assessment of ovarian function. Obstetrics & Gynecology, 109(6): 1404-1410. -Based on these data what levels of FSH and oocytes retrieved would you predict for a woman who is postmenopausal?