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PSY210H1F Lecture 1

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University of Toronto St. George
Justin Mc Neil

PSY210H1F L1, Sept 11, 2012 1 chromosome can be split into 2 alleles (a single strand Introduction of DNA) Human brain most complex organ o Alleles = dominant or recessive o Rec will only manifest when paired w another rec allele How does simple become complex How do children & adults think differently? o Dominant allele always expressed o Experience or fundamentally dif thought processes how Each haploid cell (from each parent) contains 1 type of do they develop? the allele so 50% chance of getting either allele Ppl made thru envt or genetics? Can also have incomplete dominance, codominance o Ex. Parenting Gender, emotion, morality Dominant or Recessive? New syllabus w proper readings posted tmrw Lectures posted Monday evening Tests: Noncumulative o Multiple choice (from txtbk) o Short answer (from lecture) Piaget = most influential person in Developmental Psych Essay: Relating to every-day life Argumentative paper take a side and argue it, try to convince the reader that they are correct For a child to have red hair both parents mustve had a Should be grounded in research and in fact recessive allele for red hair Talk about why the other side is wrong so the other o Ex. Same for blue eyes argument in addressed Make an informed decision about a particular topic Genetic Disorders Thesis statement: trying to sum up essay in one sentence o Can disprove another argument Can use evidence to support our personal beliefs/experiences o Can use personal pronouns (ex. I) How are Babies Born? Inherit chromosomes from mother & father Chromosomes composed of DNA o 23 chromosome pairs Usually recessive predispositions towards mutation; o 46 chromosomes in total maladaptive evolutionarily o Made of strands of DNA o Down syndrome Genes: segments of DNA along a chromosome Trisomy21 o Determines all physiological being Decreases in cognitive ability o Can affect basic personality, how view world, Facial difs intelligence, emotional responses & empathy o Cystic fibrosis o Phenomenally important to development Life-shortening unlikely to reproduce Humans 99% genetically similar o Phenylketonuria (PKU) o 1% many difs o Sickle cell anemia Some are dominant How Are Traits Inherited o Huntingtons disease Degenerative Starting at age 35, then have 20yrs left to live If parents have it, children have 50% chance of having Can persist since usually have kids by age 35 Sex-based inheritance abnormal X can be counteracted by normal X o Men more at risk for certain illnesses, tend to be less Simple Punett Square healthy Basic biology o Hemophilia men more at risk Paired chromosome o Worldwide: more boys than girls born 700 male births per 100 female births? o Canada: commercial surrogacy illegal o Quebec: surrogacy illegal What can be done? o If illegal, transaction may be blocked Phenylketonuria: treatable w diet Contract void Cystic fibrosis: manageable w treatment into adulthood What happens to child? o More children now living into adulthood Genetic counseling Older parents o Screening o Women over a certain age (55) at greater risk for o Can advise parents about risk of having a child w children w genetic abnormalities particular genetic disorder o Same issues w men also die earlier by avg 6yrs o Genetic disorders can be detected o Evolutionarily adaptive? o Grps that are more at-risk can seek alternatives In old age child in university Ex. Women at older ages Prob dead by the time child married o Financial issues, school Alternatives Eugenics Alternative fertilization o Donor insemination o Hard to isolate genes o Maybe can screen for non-fatal traits Ex. If father is carrier of Huntingtons Ex. Useful for same-sex couples Ex. Screening for gender, skin colour, intelligence attractiveness o In-vitro fertilization Ex. Damage to fallopian tubes ova cant get to Designer babies? o But at what pt does it become wrong to alter uterus test tube babies someones genetic structure? Semination conducted outside body, then embryo implanted into uterus Pre-Natal Envt Zygote Surrogate Parenthood o Woman agrees to carry child for couple o First 2 weeks o Fixes to uterus o Ex. Same-sex male couple that cant become pregnant o Ex. Couple doesnt want to risk pregnancy Embryo o 3-12 weeks Ethical Issues
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