Chap 3 - Knowthepr

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Main Points to Learn When Covering Chapter 3 Know the difference between genotype and phenotype Understand how genes affect behavior Be able to name the basic parts of the nervous system Understand how nerve impulses are transmitted Know the major divisions of the nervous system Know the primary functions of these divisions Know the main neurotransmitters and their roles
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DNA The long, spiralling molecule that orchestrates the cell's daily operations and provides the genetic blueprint for the physical characteristics of all living organisms. When made up of two complementary strands, the strands intertwine like a spiral staircase to form a structure called a double helix. Subunits, called bases, are the rungs of the staircase.
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gene A sequence of DNA that represents a fundamental unit of heredity.
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genotype The entire genetic identity of an individual, including alleles, or gene forms, that do not show as outward characteristics.
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chromosomes The self-replicating genetic structures of cells, formed from DNA and protein, found in the cell nucleus. Each chromosome contains hundreds or thousands of the genes that form our hereditary blueprint. Humans have 23 pairs of chromosomes (each parent contributes one chromosome in each pair), containing a total of 50,000 to 100,000 genes from each parent.
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phenotype The outward physical characteristics of an organism.
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behavioral geneticists study how genes and the environment interact to influence psychological activity
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www.drugabuse.gov
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www.drugabuse.gov
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