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Unformatted text preview: Psych 140 Ch. 2 Notes The Human Heritage: Genes and the Environment - Each chromosome is a single molecule of DNA. - Zygote the single cell formed at conception from the union of the sperm and the ovum- Germ cells the sperm and the ova, which are specialed for sexual reproduction and have half the number of chromosomes normal for a species. - Meiosis the process that produces sperm and oba, each of which contais only half of the parent cells original complement of 46 chromosomes.m- Monozygotic twins Twins that come from on zygote and therefore have identical genotypes (share all genetic material)- Dizygotic twins Twins that come from two zygotes (share 50% of genetic matieral)- Discrete Traits Traits involving a sigle gene that operate as either or traits because a person either has one or does not- Polygenic trait a genetic trait that is determined by the ineraction of several ghenes- Sex-linked characteristics traits determined by genes that are found on only the...
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This note was uploaded on 09/11/2008 for the course PSYCH 140 taught by Professor Christine during the Fall '08 term at University of California, Berkeley.
- Fall '08