Human skin color varies widely around the world, and children do not always exhibit the exact same coloring as their parents. Based on this information, what is true about human skin color?
A.
Skin color is not a genetic trait.
B.
A single pair of alleles controls this trait.
C.
It’s an example of incomplete dominance.
D.
It’s an example of polygenic inheritance.
Answers
Answer:
Its D. It’s an example of polygenic inheritance.
Explanation:
It is an example of polygenic inheritance is true about human skin color.
Human skin colour is so different around the world, and children do not always inherit the exact same colour as their parents it varies in colour, shade and tone. It is an example of polygenic inheritance because the human skin colour has multiple genes hence the name polygenic inheritance.
The traits that are expressed are the result of multiple genes. Since more than one gene is expressed the resultant trait becomes the combination genes that get selected.
If the A, B, C are three different genes for the black colour and a, b, c are the genes for white; then the phenotype expressed as AaBbCc could be brown, if AABbCc is expressed then the result could be dark brown.
If aaBbcc then the skin colour will lean towards white. Likewise, there are thousands of outcomes that can be derived in polygenic inheritance.
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