Respuesta :
There are many traits in human which is determine by polygenic inheritance such as skin co-lour, hair co-lour, eyes co-lour, height , risk for diseases and resistance , intelligence, etc.
Inheritance of skin pigmentation is polytechnic inheritance .In thee F2 generation -AaBbCc * AaBbCc mate they varying range from dark to very light ,F2 generation of two triple hetero-zygotes.
Punnet square showing F2 generation offspring continuous variation.The expression of poly-genes is greatly influenced by environment conditions.There are genetically basis for human skin co-lour because of more than 100 different genes involved which produce melanin pigment which responsible for co-lour of a person.
To learn more about melanin pigment here
https://brainly.com/question/1406777
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