The complexity of an organisms genetic information means that much of the unusual variation that occurs among organisms can best be explained as the result of developmental mistakes.
New findings about the nature of the genetic control of neural development support the work of some scientists who argue that the computer is an extremely useful model for understanding the nervous system.
The major discovery made by scientists studying the genetic control of neural development is that both imprecision and gross developmental error can be traced to specific types of mutations in specific genes.
18. According to the passage, one of the reasons it has been assumed that there is an important random element in human neural development is that
genes cannot specify certain types of developmental processes as well as they can others
the intricacy of the nervous system allows small developmental errors to occur without harmful effects
the amount of information contained in the genes is less than the amount necessary to specify the location of the neurons
the number of neurons in the human brain varies greatly from individual to individual
it is theoretically impossible for an organism to protect itself completely from gross developmental mistakes
19. The author suggests which of the following about the findings of information theorists?
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