Igcse Model Questions Vol1 2017 Biology Question 12
Practice objective / multiple choice question 12 from the 2017 Igcse Model Questions Vol1 Biology examination.
Two beetle species have a 1500‑base‑pair mitochondrial DNA fragment. Sequencing shows 45 nucleotide differences between them. The mutation rate is 2 × 10⁻⁸ per site per generation. Species A has an average generation time of 0.5 years, while species B averages 1 year. Assuming mutations accumulate equally in both lineages, estimate the time since the two species diverged, expressed in millions of years (to two decimal places).
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This is Igcse Model Questions Vol1 2017 Biology Question 12. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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