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Unformatted text preview: b) deactivating enzymes intercept neurotransmitters c) reuptake occurs, and neurotransmitters are taken back into the axon SNPs-SNP is a single nucleotide is responsible for the difference between 2 alleles-some genes exist in several copies on the same chromosome-the environment can transiently or permanently turn genes on and off-genes can be silenced by methylation (adding CH-3 groups) to DNA nucleotides-this methylated state can be inherited without changes in the DNA sequence itself-this new field is known as epigenetics Development-Nervous system is part of the ectoderm Neural tube defects-anencephaly (the front end of the tube does not close; the brain fails to develop; lethal-spina bifida (the back end of the tube does not close)...
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- Fall '09