We know that individual genotypes play a part in the

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We know that individual genotypes play a part in the development of an attribute ifa. identical twins reared together show greater resemblance on that attribute thanfraternal twins reared apartb. unrelated adoptees reared together show greater resemblance on that attribute than unrelated children reared apart*c. adopted children show greater resemblance on that attribute to their birth parents than to their adoptive parentd.identical twins reared together show greater resemblance on that attribute than identical twins reared apart
Bailey and his associates found that the concordance rate for homosexuality was greater among identical twins (52%) than among fraternal twins (22%). From these data, we can conclude that*a. homosexuality is a genetically-influenced attribute
Behavioral geneticists use heritability coefficients _____.
To estimate the heritability of a particular attribute from twin data, a researcher would have to know
If we find that identical twins raised together are notably dissimilar on an attributelike IQ, that is known to be genetically influenced, we can conclude thata.shared environmental influences are responsible for the dissimilarityb.nonshared environmental influences are responsible for the dissimilarityc.genotype is notresponsible for the dissimilarityd.shared environmental influences are responsible for the dissimilarity and genotype is notresponsible for the dissimilarity*e.nonshared environmental influences are responsible for the dissimilarity and genotype is not responsible for the dissimilarityThe only thing that can keep identical twins reared together from resembling each other on an attribute is nonshared environmental influences. Therefore, it makes sense that we could estimate how much nonshared environment (NSE) contributes to the attribute as follows: NSE =a.(r identical twins- r fraternal twins) X 2b.1 - (H + SE)

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