In attempting to study the degree to which genetics influences activity levels in newborns,a researcher compares monozygotic and dizygotic twins for their level of similarity on that trait.This research is attempting to determine the _____ of the trait activity levels.

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The research is attempting to determine the heritability of the trait activity levels by comparing the similarity in activity levels between monozygotic (identical) and dizygotic (fraternal) twins. Since monozygotic twins share 100% of their genetic material whereas dizygotic twins share only 50%, any similarities seen in activity levels between monozygotic twins are likely due to genetics, and heritability can be estimated. Therefore, the best choice is D, heritability. Phenotype refers to the physical expression of an individual's genetic makeup, genotype refers to an individual's genetic makeup, and karyotype refers to the number and appearance of chromosomes in the nucleus of a eukaryotic cell.

In Attempting to Study the Degree to Which Genetics Influences