Answer: random mating in the population.
- A random mating in the population
- B gene migration between groups
- C genetic drift in small groups
- D recurrent mutation of alleles
Correct answer: A. random mating in the population
Explanation: Random mating helps maintain Hardy-Weinberg equilibrium; gene flow, genetic drift, mutation and selection are the factors that disturb it.
A simple phylogenetic tree: a common ancestor branches into several descendant lineages over time, with each branch point marking a speciation event.
Concept context
Origin of life, Darwin's theory, natural selection, speciation, and evidence for evolution.