The chapter delves into the complexities of genetic risks and traits, emphasizing the role of multiple DNA differences across the genome in influencing polygenic traits and diseases. It discusses the potential applications of polygenic risk scores in areas like embryo selection and preconception screening, while also addressing the limitations and challenges of current genetic testing methods in fully assessing genetic risks and traits. The chapter touches on controversial topics surrounding genetic testing, ethical considerations in trait selection, and the potential future implications of genetic modification on human evolution and population health.

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