Three basic prenatal methods of detecting abnormalities are amniocentesis, chorionic villus sampling (CVS), and ultrasound. Describe each, noting what general kinds of abnormalities each can detect
What will be an ideal response?
Amniocentesis involves inserting a large, hollow needle into the amniotic sac to obtain fetal body cells for analysis; CVS obtains fetal cells by catheterization through the cervix. Each can detect chromosomal abnormalities as well as many recessive abnormalities and diseases. However, amniocentesis cannot be carried out until early in the second trimester of the pregnancy (the 11th to 14th week, at the earliest), whereas CVS can be carried out just after the end of the embryonic stage (ninth week). The results from an amniocentesis are generally not available until two weeks after the procedure has been completed; the results from a CVS procedure may be available within 24 hours. Ultrasound is a sonar-like scanning of the fetus without the risk of infection, etc., associated with the other two methods. But ultrasound can only detect gross physical abnormalities (i.e., as indicated by the shape of the fetus).
You might also like to view...
Drive theory and arousal theory both suggest that motivation has its roots in ____
a. ?learning b. ?mental processes c. ?emotions d. ?biology
Under what circumstances can divided attention occur most easily?
a) when you are under stress b) when attention to small details is critical c) when you are performing two tasks that are highly related d) when you are performing tasks that are simple and well-practiced
Albert is engaged and is looking forward to starting a new chapter of his life with his wife-to-be
He knows that many marriages end in divorce, and wants to do everything he can to ensure that he and his wife remain happy together for their entire lives. What is one of the most important things Albert can do in his marriage to ensure that he stays married? a. have a large salary b. make sure that he contribute to family duties c. insist that his wife perform all of the "woman's" duties while he performs the "man's" duties d. require that his wife stay home and raise their children
The more difficult a group is to get into, the more appealing it becomes to us. What is this effect called?
A. hazing effect B. escalation trap C. initiation effect D. sunken cost fallacy