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DNA Double Helix Structure Quiz

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Questions and Answers

What can alter the phenotype of an organism according to the text?

Changing genes only

Changes in protein structure

Altering punctuation marks (correct)

Mutations in coding regions

When did the mutation giving rise to blue eye color likely occur?

25,000-30,000 years ago

6,000-10,000 years ago (correct)

15,000-20,000 years ago

1,000-5,000 years ago

What determines eye color according to the text?

Presence of pigments in the irises

Thickness of melanin in the ABL

Amount of melanin, thickness, density of iris, and collagen fibers (correct)

Level of collagen fibers in the iris

What is the function of OCA2 gene mentioned in the text?

Unknown function Signup and view all the answers

What does HERC2 encode for?

Protein implicated in DNA repair regulation and pigmentation Signup and view all the answers

Where was a single nucleotide change found in people with blue or brown eyes as per the text?

Intron (non-coding region) of HERC2 Signup and view all the answers

What role does melanin play in determining eye color?

Primary role Signup and view all the answers

What aspect is responsible for brown eyes having high levels of melanin?

Thick stroma with white collagen fibers Signup and view all the answers

What can small changes in a DNA sequence lead to according to the text?

Dramatic effects on an organism Signup and view all the answers

What is an example of an alteration that can affect an organism's phenotype according to the text?

Modifying the DNA sequence Signup and view all the answers