Biology (Mader), 10th Edition

Chapter 11: Mendelian Patterns of Inheritance

Skin Color Gene

Objective: The student will identify the apparent role of a newly identified gene in skin color variation.

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1.

According to the article:
A)skin color production is controlled by the expression of only one gene
B)the gene product analyzed in zebra fish plays a role the melanin production pathway
C)people with dark skin colors produce mainly eumelanin
D)b and c
E)all of the above
2.

In lighter skinned individuals, coloration appears to be influenced by:
A)melanin particle size
B)melanin particle number
C)fat underlying the skin
D)a and b
E)all of the above
3.

Researchers have identified a human counterpart (SLC24A5) of the zebra fish coloration gene, and it appears to:
A)be about 500 amino acids in length
B)have roughly 70% amino acid identity to the fish gene
C)have two forms or alleles that differ by one amino acid
D)all of the above
4.

Based upon this research:
A)it appears that lighter skinned individuals possess predominantly the "A" form of the human skin coloration gene (SLC24A5)
B)it appears that individuals possessing predominantly the "T" form of the human skin coloration gene (SLC24A5) are of European descent
C)it appears that the mutation resulting in the "T" form of the human skin coloration gene (SLC24A5) was selected for in Northern parts of the globe
D)b and c
E)all of the above
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