Gce Model Questions Vol1 2020 Biology Question 48

Practice objective / multiple choice question 48 from the 2020 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2020 Biology Objective / Multiple Choice Medium Difficulty
Question 48 GCE_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • objective

Genetic distances (percent sequence difference) have been measured between four species (A, B, C, D). For pairs that include species D the distances are based on mitochondrial DNA, which mutates at a rate of \(0.5\%\) per million years; for all other pairs the distances are based on nuclear DNA, mutating at \(1\%\) per million years. The observed distances are:\n\n- A-B: 2 %\n- A-C: 5 %\n- B-C: 4 %\n- A-D: 9 %\n- B-D: 8 %\n- C-D: 7 %\n\nUsing the appropriate mutation rate for each pair, estimate the divergence time (in million years) for each pair and state which pair diverged earliest.

Answer Options

Correct Answer A. A-D diverged earliest; estimated divergence time ≈ 18 million years.
B. C-D diverged earliest; estimated divergence time ≈ 16 million years
C. B-C diverged earliest; estimated divergence time ≈ 20 million years
D. A-D diverged earliest; estimated divergence time ≈ 22 million years
Correct Answer
A
Correct Option:
A-D diverged earliest; estimated divergence time ≈ 18 million years.

About This Question

This is Gce Model Questions Vol1 2020 Biology Question 48. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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