Blood type is the only listed trait affected by only genetics.
Skin color and big muscles are, in most cases, dependent on both genetics and the environment.
Athletic ability is learned skill.
66Blood type is the only listed trait affected by only genetics. Skin colour and big muscles are, in most cases, dependent on both genetics and the environment.
The pigment which gives colour to the skin is called melanin.
Unique cells of skin make melanin pigment, unhealthy and damage skin will affect the production of melanin pigment.
Thus Skin colour and big muscles are, in most cases, dependent on both genetics and the environment.
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