PSY 230 Lecture 4: Chapter 3
Document Summary
Proteins build, regulate and maintain our brains: 20 amino acids make up a protein. If one gene is missing or off by one letter, can lead to disease: genes in uences the entire lifespan. Methylation rna enhances, transcribes, connects, and alters gene instructions through life. Dna: dna is packed into chromosomes, structure. Made up of base pairs (a & t, g & c) Chromosomes: come in pairs 23 pairs (46 total) Pairs are either homozygous or heterozygous for a gene: chromosomes are made up of genes. Genes are contained in a linear order: genes per chromosome ranges from 231 to 2968, anomalies in chromosome or genetics. Change in number: occur when a chromosome is missing, or there are extra. Not rare the zygotes just usually don"t develop: parents age play a role in this especially mothers, down syndrome. 3 chromsomes number 21: problems with pair 23. Odd number of sex chromosomes may lead to impaired cognition or sexual maturation.
