What is amniocentesis and why would it be used?
What will be an ideal response?
Amniocentesis involves using a needle to draw a small amount of fluid from the amniotic sac; the cells in this fluid
are then cultured for genetic testing. This procedure ? which can be conducted after the 14th week of pregnancy ?
is advised when parents have a high risk of passing a genetic defect to the baby, or when the mother is 35 or older.
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A scientist, conducting a research study on sleep and learning, questions her own objectivity and decides to let a third person, not associated with conducting the experiment, score the tests. The scientist is probably trying to eliminate __________ bias
a) experimenter b) sample c) control d) treatment
Seven-year-old Adriana ran in from school and shouted, "Hey, Mom did you know that 2+3 is the same as 3+2?" Adriana is demonstrating
a. centration. c. reversibility. b. decentering. d. conservation.