10 Questions
What can alter the phenotype of an organism according to the text?
Altering punctuation marks
When did the mutation giving rise to blue eye color likely occur?
6,000-10,000 years ago
What determines eye color according to the text?
Amount of melanin, thickness, density of iris, and collagen fibers
What is the function of OCA2 gene mentioned in the text?
Unknown function
What does HERC2 encode for?
Protein implicated in DNA repair regulation and pigmentation
Where was a single nucleotide change found in people with blue or brown eyes as per the text?
Intron (non-coding region) of HERC2
What role does melanin play in determining eye color?
Primary role
What aspect is responsible for brown eyes having high levels of melanin?
Thick stroma with white collagen fibers
What can small changes in a DNA sequence lead to according to the text?
Dramatic effects on an organism
What is an example of an alteration that can affect an organism's phenotype according to the text?
Modifying the DNA sequence
Test your knowledge of the structure of DNA double helix, including the arrangement of backbones running in opposite 5′→ 3′ directions. Learn about how DNA can store digital data and the new methods of storing data in nucleotide bases.
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