AP BIOLOGY

Detailed explanation-1: -A polygenic trait is a characteristic, such as height or skin color, that is influenced by two or more genes. Because multiple genes are involved, polygenic traits do not follow the patterns of Mendelian inheritance .

Detailed explanation-2: -Inheritance of skin colour is an example of polygenic inheritance.

Detailed explanation-3: -Three examples of polygenic traits in humans are height, skin colour and eye colour. These traits are governed by multiple genes.

Detailed explanation-4: -In humans, height, skin color, hair color, and eye color are examples of polygenic traits. Type-2 diabetes, coronary heart disease, cancer, and arthritis are also deemed polygenic. However, these conditions are not just genetic since polygenes can be influenced by environmental factors.

Detailed explanation-5: -Human skin color is a “polygenic” trait, meaning multiple gene loci are involved in its expression. At last count, the International Federation of Pigment Cell Society has determined that there are a total of 378 genetic loci involved in determining skin color in human and mice.