Exam 27: Reproduction and Embryonic Development

Which of the following occurs during the process of labor?

Which of the following processes dominates the third trimester of human development?

Contractions in uterine smooth muscle during labor are initiated by

The body cells of a turkey have 80 chromosomes each. How many chromosomes would be found in a male turkey's sperm cells?

After reading the paragraphs below, answer the questions that follow. Home pregnancy test kits can detect whether a woman is pregnant within one to three 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 three to five 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. -If you were designing a home pregnancy test kit, which of the following statements would you include in the instructions in an attempt to minimize false negative results?

What occurs during gastrulation?

Suppose that during the embryonic development of a hand, homeotic gene expression is altered such that the dorsal-ventral axis is switched. What is the most likely outcome of this scenario?

Reproductive systems with external fertilization are most common in

Which of the following statements comparing spermatogenesis and oogenesis is true?

After reading the paragraphs below, answer the questions that follow. Home pregnancy test kits can detect whether a woman is pregnant within one to three 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 three to five 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. -If you were designing a home pregnancy test kit, which of the following statements would you include in the instructions in an attempt to minimize false positive results?

The human embryo's first blood cells arise in the

Which of the following statements regarding sexual reproduction is true?

Which of the following describes apoptosis?

Fission is an asexual process

Suppose that diploid cells of the seminiferous tubules encounter errors during the cell cycle and mitosis. This results in the primary spermatocytes having a 4n number of chromosomes. Assuming that meiosis proceeds normally, which of the following would be true?

After reading the paragraphs below, answer the questions that follow. Home pregnancy test kits can detect whether a woman is pregnant within one to three 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 three to five 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 their test kits?

Which of the following statements regarding spermatogenesis and oogenesis is true?

Which of the following occurs during cellular migration and development into specialized tissue?

The brain and spinal cord are formed from

The yolk sac of humans