Describe amniocentesis, and discuss its use as a prenatal diagnostic method
What will be an ideal response?
Amniocentesis is the most widely used prenatal diagnostic technique. Women of advanced maternal age are prime candidates. The procedure consists of the insertion of a hollow needle through the abdominal wall to obtain a sample of fluid in the uterus. Cells are examined for genetic defects. It can be performed by the 14th week after conception, and test results are usually given 1 to 2 weeks later. There is a small risk of miscarriage associated with the procedure. Therefore, amniocentesis should not be used routinely.
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According to Piaget's observations, how old are babies at the beginning of the stage in which they will first successfully search for an object after it is hidden under a cloth as they watch?
a. 1 months b. 2 months c. 4 months d. 8 months
The 5-year-old of two very busy parents has been throwing tantrums. Whenever the child goes off the deep end, one or both of his parents immediately come to his side and fuss over and cajole him
Nevertheless, his tantrums do not diminish; they even seem to increase. We may assume that his parents' fussing over him serves as a _______. a. negative reinforcer b. punisher c. positive reinforcer d. model