PSY355H5 Lecture Notes - Lecture 2: Twin Study, Ethology, Epigenetics
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), genetic drift (random loss of alleles; by chance, certain individuals that may carry certain alleles in a population may not mate, therefore you will lose those alleles) Humans: have diploid cells and haploid cells (sperm and egg: about chromosomes: So why do we look so different though: some possible reasons: (a) we are sensitive to small changes, you can also create such differences, artificial selection, dog breeds, rats, cows, etc, you can also select for behavioural features. Colorful predators rarely cause stomach ache and unusual tasting meals rarely attack. Basically it(cid:495)s all about natural connections that we encounter in the environment: operant conditioning constraints, bar press -> food = ok (in rats, very easy, because they manipulate food anyway in natural environment) Careful handling of dangerous species is not required and frantically. If app is mutant -> a-beta-2-42 results which is toxic to the neurons.
