Summary: Twin Research In Psychology

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  • Lecture 1A: Historical perspective & Mendel

    This is a preview. There are 56 more flashcards available for chapter 27/10/2020
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  • Which childhood psychopathology is the most heritable?

  • Do genes en environment always play a rol in complex traits?

  • What is the liability-threshold model?

    A model that assumes that dichotomous disorders are due to underlying genetic liabilities that are normally distributed. The disorder appears only when a threshold of liability is exceeded.
  • What did Carl linnaeus?

    He created a system that systematically categorize the different species he saw.
  • What causes color blindness?

    Color blindness is caused by a recessive allele on the X chromosome. Males only have one X chromosome, so if they have one allele for color blindness on their single X chromosome, they are color blind. For females the allele must be on both of their X chromosomes.
  • Explain Mendel's First law: The law of segregation.

    A recessive element is expressed only if both elements are recessive. While a dominant element is expressed when one or two are present.
  • What is the definition of Mendelian disorders?

    Disorders that follow the Mendelian inheritance patterns.
  • What are qualitative traits?

    Traits that are influenced by a single gene. These traits follow a simple pattern of inheritance and the phenotypes have distinct categories (present/absent). Traits expression is unaffected by the environment.
  • What is the Huntington's desease?

    An inherited brain disorder causing very fast worsening of the physical, cognitive and emotional self. The risk of HD in the offspring is 50% due to one dominant allele. 
    No cure and effective treatment. 

    Develops relatively old
  • For which cases the 2nd Mendel's law applies?

    1. For genes on different chromosomes
    2. For genes that are far apart on the same chromosome.

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