ch 2 - CH 2: BIOLOGICAL & ENVIRONMENTAL FOUNDATIONS...

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Phenotype vs Genotype Phenotype – directly observable characteristics Genotype – genetic info that determines our characteristics Genes – segment of DNA along the link of a chromosome 23 chromosome pairs, made up of DNA DNA duplicates through mitosis – makes proteins Sex cells – gamete Sperm and egg unite, resulting in zygote Formed through meiosis cell division XX = females, XY = males (23 rd pair of chromosomes are for sex) Twins – female releases two eggs, each fertilized by different sperm Genetic Inheritance Dominant – recessive inheritance Homozygous – 2 same alleles Heterozygous – 1 dominant, 1 recessive allele Only one allele affects the child’s characteristics Incomplete dominance Heterozygous – both alleles play a part – both traits show Curly hair + straight hair = wavy hair Mutation Can result in the creation of harmful genes Sudden, permanent changes in your DNA Germ-line mutation On cells that give rise to gametes
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Affects your future offspring Sematic mutation Normal body cells mutate
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This note was uploaded on 01/04/2012 for the course PSY 231 taught by Professor Limegrover during the Fall '08 term at Miami University.

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ch 2 - CH 2: BIOLOGICAL & ENVIRONMENTAL FOUNDATIONS...

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