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5 Cards in this Set
- Front
- Back
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continuos variation
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when a trait is characterized by many different phenotypic classes that vary by small degrees from one extreme to another, usually found in traits that are controlled by multiple genes
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penetrance
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the percentage of individuals with a mutation or mutant genotype that actually express the mutant trait
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twin study
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a classic method for assigning values to the roles of genes and the environment in the determination of behavioral traits
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identical twins
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monozygotic- formed when a single zygote splits into 2 embryos within the first 2 weeks of development, share the same sets of chromosomes and genes; genetically identical
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fraternal twins
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dizygotic- two eggs produced during 1 menstrual cycle, each fertilized by different sperm
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