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Chapter 3

Chapter 3 notes

1 Page
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Department
Psychology
Course Code
PSY100H1
Professor
Michael Inzlicht

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Twin studies compare similarities between different types of twins to determine
the genetic basis of specific traits.
-Monozygotic twins a.k.a. identical twins, are the result of one zygote dividing
into two, each having the same chromosomes and the genes they contain
-Dizygotic twins a.k.a. fraternal or non-identical twins, are the result of two
separately fertilized eggs and are no more related than any other pair of siblings
-The process of fertilization occurs separately to produce the two zygote, which
then develop independently.
Adoption studies compare the similarities between biological relatives and
adoptive relatives.
-adopted siblings have similar home environments but different genes
-therefore, the assumption is that similarities among adopted siblings have more
to do with environment than genes.
Heredity- is the transmission of characteristics from parents to offspring by means
of genes
Heritability- which is a statistical estimate of the portion of observed variation in
a population that is caused by differences in heredity.
-refers to differences in a certain trait among individual, not the trait itself.
-refers to population, not to individuals
-the heritability for a trait depends on variability within a population
Variation- is the measure of the overall amount of differences among people.
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Description
Twin studies compare similarities between different types of twins to determine the genetic basis of specific traits. -Monozygotic twins a.k.a. identical twins, are the result of one zygote dividing into two, each having the same chromosomes and the genes they contain -Dizygotic twins a.k.a. fraternal or non-identical twins, are the result of two separately fertilized eggs and are no more related than any other pair of siblings -The process of fertilization occurs separately to produce the two zygote, which then develop independently. Adoption studies compare the similarities between biological relatives and adoptive relatives. -adopted siblings have similar home environments but different gene
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