Carla, who is participating in a dichotic listening study, is asked to ignore any information that is presented to her right ear. She finds that she has no problem doing this except for when she thinks she hears her name in her right ear. Carla is experiencing: a) the cocktail party effect.

b) blindsight

c) inattentional blindness

d) change blindness

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Explain why phospholipid molecules form a bilayer. (3 marks)

Why does meiosis produce cells with half the chromosomes? o a. most of the chromosomes are not necessary to keep an organism alive. b. a gamete needs only half the number of chromosomes because two gametes join together. o c. it makes the gametes easier to move around in the organism. o d. it is faster to produce gametes with fewer chromosomes.