Activity 13.3: Complete the table. Directions: Explain and give example for each type of reproductive isolating mechanisms. Pre-zygotic Reproductive Isolating Explanation Еxample Mechanisms Habitat Isolation Behavioral Isolation Post-zygotic Reproductive Isolating Mechanisms Explanation Еxample Hybrid inviability Hybrid breakdown

VISUALIZE Label the diagram.

View this time-lapse movie (http://openstaxcollege.org/l/conceptus) of a conceptus starting at day 3. What is the first structure you see? At what point in the movie does the blastocoel first appear? What event occurs at the end of the movie?

Which contraceptive method is 100 percent effective at preventing pregnancy? condom oral hormonal methods sterilization abstinence

Birth Defects and Multiple Births A woman who carries multiple offspring at the same time increases the risk of some birth defects. FIGURE 42.18 shows the results of Yiwei Tang's study of birth defects reported in Florida from 1W6 to 2000. Tang compared the incidence of various defects among single and multiple births. She calculated the relative risk for each type of defect based on type of birth, and corrected for other differences that might increase risk such as maternal age, income, race, and medical care during pregnancy. A relative risk of less than 1 means that multiple births pose less risk of that defect occurring. A relative risk greater than 1 means multiples are more likely to have a defect. FIGURE 42.18 Prevalence, per 10,000 live births, of various types of birth defects among multiple aria single births. Relative risk for each defect is given after researches adjusted for the motor's age, race, previous adverse pregnancy experience, education, Medicaid participation during pregnancy, as well as the infant's sex and number of siblings. 4. Does a multiple pregnancy increase the relative risk of chromosomal defects in offspring?

The training of animals usually involves ______________ ___________ . imprinting classical conditioning operant conditioning cognitive learning

Figure 17.15 In 2011, the United States Preventative Services Task Force recommended against using the PSA test to screen healthy men for prostate cancer. Their recommendation is based on evidence that screening does not reduce the risk of death from prostate cancer. Prostate cancer often develops very slowly and does not cause problems, while the cancer treatment can have severe side effects. The PCA3 test is considered to be more accurate, but screening may still result in men who would not have been harmed by the cancer itself suffering side effects from treatment. What do you think? Should all healthy men be screened for prostate cancer using the PCA3 or PSA test? Should people in general be screened to find out if they have a genetic risk for cancer or other diseases?

VISUALIZE Label the following diagram and explain what this diagram illustrates.

A dilatation and curettage (DC) for missed AB (missed abortion is the technical term for miscarriage) is on the OR schedule. Danny, a CST, finished setting up and went to the preoperative care unit (PCU) to help the circulating nurse bring the patient back to the OR. The young woman was tearful and said she had been told the 16-week fetus had been infected with a parasite she may have gotten from her cat. Her husband was deployed overseas and she had no one to help with cleaning the house. To which parasite was she likely exposed?