PSYC 335 Chapter Notes - Chapter 3: Twin, Twin Study, Y Chromosome
22 Feb 2018
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2 types of genes: (a) structural genes: codes for the production of different proteins which serve many different functions (b) regulator genes: control the expression of structural genes. Gene expression is sensitive to the environmental context: deoxyribonucleic acid (dna): a stair-like, double helix molecule that carries genetic information on chromosomes. Composed of 4 bases: adenine (a), thymine (t), guanine (g), cytosine (c) Nucleotide: a single rung of a dna molecule, made up by a pairing of two of these bases: only a t & g c. Base pair: the unit of length of the double-stranded dna molecule the sequence of the base pairs determines the coded information carried by the gene. & seals off each set of 23 pairs of chromosomes (ii) germ (sex) cells: reproduce through meiosis. & seals off each set of 23 chromosomes: alleles: variants of the same gene located at the same position on each pair of chromosomes.
