In the situation where both the mother and the father carry the sickle-cell trait, what is the probability that they will produce a child with the sickle-cell trait?

A psychologist is creating a list of key events in the history of I/O psychology. Which of these will have the most prominent position on that list?

a) development of Maslow's needs hierarchy b) development of operant conditioning by B. F. Skinner c) development of tests to classify soldiers during World War I d) development of the Minnesota Multiphasic Personality Inventory

Which of the following is true of ovum and sperm?

A) An ovum carries a Y sex chromosome; a sperm carries an X sex chromosome. B) An ovum carries an X sex chromosome; a sperm carries either X or Y sex chromosomes. C) An ovum carries an X sex chromosome; a sperm carries a Y sex chromosome. D) An ovum carries either X or Y sex chromosomes; a sperm carries an X sex chromosomes.