In a population that is in Hardy-Weinberg equilibrium, the frequency of individuals expressing a recessive autosomal trait is 0.09. What is the expected frequency of heterozygous individuals in this population?
Cambridge International A Level · Biology (9700)
Selection and evolution:練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 1 問。すべて「Selection and evolution」からの出題です。
Following a severe environmental disaster that drastically reduces a population size to a small fraction, which genetic phenomenon is most likely to have a major impact on the surviving population's gene pool?
Which statement best describes the effect of disruptive selection on a phenotypic trait within a population?
How does the widespread use of a specific antibiotic act as an agent of natural selection on a bacterial population?
Which of the following conditions must be met for a population to remain in Hardy-Weinberg equilibrium across multiple generations?
In a population of a certain species of rodent, the allele for black fur (\( B \)) is dominant over the allele for brown fur (\( b \)). In a specific habitat, 36% of the population shows the brown fur phenotype.
(a) Using the Hardy-Weinberg principle, calculate the frequency of the dominant allele (\( p \)) and the frequency of the heterozygous genotype (\( 2pq \)) in this population. Assume the population is in Hardy-Weinberg equilibrium.
(b) Explain how directional selection might affect these allele frequencies if the environment changes to favor individuals with darker fur to avoid predation.
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