PSYC 203 Lecture Notes - Lecture 5: Uracil, Cytosine, Guanine
14 Nov 2017
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Document Summary
Dominant recessive pattern: dominant genes always express their characteristics, recessive genes come in pairs to express their characteristics. Genetic foundations: chromosomes store and transmit genetic information, genes segments of dna located along the chromosomes, dna substance of which genes and chromosomes are made. Alleles: two forms of the same gene, appear at the same place on both chromosomes in a pair, one inherited from each parent, homozygous - the two alleles are alike, heterozygous - the alleles differ. The 22 pairs of chromosomes that are not sex chromos: 23rd pair of chromosomes. Sex chromosomes: determines sex, xx = female, xy = male. Mitosis one cell splits into two daughter cells each with 46 chromosomes. Medalian genetics: dominant and recessive genes. Genetic disorders: sex linked disorders, red green colorblindness, hemophilia, fragile-x syndrome (also form of genetic imprinting, caused by recessive gene on x chromosome, boys suffer more often than girls.
