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| the emergence of new structures and functions during development |
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| the study of prenatal development |
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| specialized sex cells that contain half the normal number of chromosomes |
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| movement of newly formed cells to their correct location |
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| after several cell divisions cells start to specialize |
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| twins that result from the splitting in half of the zygote |
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| twins that result from two eggs being fertilized |
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| exchange of materials carried in the bloodstream of the fetus and the mother |
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| the tendency for areas near the head to develop faster |
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| the phenomenon of a decreased response to repeated stimulus |
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| all external substances that cause harm to the fetus |
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| the greater the exposure to a teratogen, the greater risk of damage |
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| an active state of sleep that is char. by dreaming and movement |
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| a passive state of sleep that is char. by quiet, deep sleep |
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| the idea that brain activity during REM sleep helps visual dev. |
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| certain personal char., sense of goals, responsive care from someone |
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