Igcse Model Questions Vol1 2023 Biology Question 21

Practice objective / multiple choice question 21 from the 2023 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 21 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

Mitochondrial DNA of two related bird species differs at 150 nucleotide sites within a 1500‑base‑pair gene. The mutation rate is estimated at \(2 \times 10^{-8}\) per site per generation, and each generation lasts 3 years. Assuming a constant molecular clock and that mutations accumulate independently in each lineage, estimate the number of years since the two species shared a common ancestor.

Answer Options

Correct Answer A. 7.5 \times 10^{6} years (approximately 7.5 million years)
B. 9.0 \times 10^{6} years (approximately 9 million years)
C. 6.0 \times 10^{6} years (approximately 6 million years)
D. 1.5 \times 10^{7} years (approximately 15 million years)
Correct Answer
A
Correct Option:
7.5 \times 10^{6} years (approximately 7.5 million years)

About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 21. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

View More Igcse Model Questions Vol1 2023 Biology Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support