Explain how the brain, environment, and hereditary material are related.


Stress and teratogens can effect the fetus and its development by flowing through the mucus membrane. Stress experienced by the mother transfers to the baby in her womb. The result is that when the baby is born it may be more susceptible to stress. The chromosomes that the child inherits from its mother and father can also have an effect on the child’s likeliness to inherit diseases. Some diseases may develop from dominant or recessive alleles. The care and nurture of the infant, as it develops and grows, by the parents can also cause some genes to be “turned on” or “turned off.” A study was referenced in the book about rat pups and their possibility for higher stress levels due to a certain gene which was “turned off” by being nurtured (licked and groomed) more than a control group. The rat pups that had more licking and grooming were able to have the stress gene “turned off” and reacted better to stress and also continued the same pattern with their own rat pups. Therefore, the brain, environment and hereditary each play a part in the outcome of each individual.

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