We finished the chapter on polygenic and multifactorial inheritance with a discussion of the importance of twin studies in studying heritability and on some human complex traits whose relative importance of genetic and environmental factors is still not completely understood: skin color, IQ, and propensity to obesity
We started the chapter on cytogenetics, with an overview of chromosome structure and nomenclature, and the process of making a human karyotype. We followed by discussing abnormalities in chromosome number: polyploidy and aneuploidy (we described some specific cases).
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