In Gottlieb’s model, the probabilistic aspect of development refers to the idea that the characteristics of organisms at any point in their development (such as the current status of brain development or behavior) _______
a. are determined by genetic and environmental factors and the interaction of such factors, but not with absolute certainty
b. are determined by genetic mutations that are probabilistic
c. are completely determined by genes operating on brain development
d. are completely determined by the environment operating on behavior
Answer: A
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There are about 120 to 125 million rods and about 7 or 8 million cones in the human retina
Indicate whether this statement is true or false.
When a photon of light strikes a photoreceptor,
a. the photopigment unites with a molecule of vitamin A and a nerve impulse is generated. b. photopigment is regenerated. c. rhodopsin is released into the visual pathway leading from the optic disk to the occipital cortex. d. the photopigment splits, and a series of chemical events stimulates the photoreceptors so that it generates a signal. e. rhodopsin splits apart and becomes rose-colored, initiating events that stimulate the ganglion cells.