PSYC 4005 Chapter Notes - Chapter 2: Egg Cell, Cell Division, Allele
30 Oct 2014
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Document Summary
Identical twins (monozygotic) one egg, splits, same genetic material. Fraternal twins (dizygotic) two eggs, share half of the same genetic material. Deoxyribonucleic acid (dna) molecule containing genetic material. Genes section of dna with inherited traits. Gametes (sex cells) sperm/egg containing 23 chromosomes. Meiosis cell division that produces sex cells (gametes) Zygote fertilized ovum during 1st 2 weeks of conception. Heterozygous two different alleles for a trait. Dominant recessive pattern recessive gene only shows if dominant is absent, hair color. Codominant (polygenic inheritance) many genes influence a trait, skin. X linked inheritance recessive gene on x so it is more likely shown in males b/c females use other x. Hemophilia x linked blood disorder, blood fails to clot. Phenylketonuria (pku) genetic disorder damaging central nervous system if not controlled with diet @ birth. Sickle cell anemia recessive gene diseas, african most, clot occurs. Fragile x syndrome long faces, weird ears, short, anxious, mental retardation, no fmrp.
