PSYC 2510 Lecture Notes - David Buss, Evolutionary Psychology, Twin
2 May 2013
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Document Summary
Genes functional units of heredity which are composed of dna. Chromosomes rod-shaped structures within cells that carry genes. Dna (dioxyribonucleic acid) genetic characteristics coded in the structure of proteins. Sperm (23 chromos) + ovum (23 chromos) = zygote (23 pairs: xy is male & xx is female ) Made up from nucleobases (a,c,t and g: adenine, cytosine, thymine, guanine. Identification of dominant (brown eyes) & recessive genes (blue eyes) (mendelian genetics) Most behaviours are polygenic: eye colour is actually a function of 6 or more genes. Possible reasons for different eye colours (heterochromia iridium) Trauma to the eye (eg. david bowie); can happen in the womb. Mutation in an eye colour gene influences one eye, while normal" cells developed other eye: somatic mosiacism. Look across generations for genes lying close together on a chromosome. Genetic marker segment of dna with a known physical location (acgtctctata) Some portion of a trait is inherited in some way.
