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Gene pools and allele frequencies Knowledge-Based Practice

Biology · Evolution · Biology · Population Genetics

5 Biology practice questions on Gene pools and allele frequencies. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which biological process serves as the original and ultimate source of novel alleles, thereby introducing entirely new genetic variation into a population's gene pool?

    • A) Gene flow
    • B) Mutation
    • C) Natural selection
    • D) Non-random mating
  2. 2.

    According to the Hardy-Weinberg principle, what occurs to the allele frequencies within a sexually reproducing population's gene pool over time when no evolutionary mechanisms are acting upon it?

    • A) The allele frequencies remain stable and unchanged from generation to generation.
    • B) The dominant allele frequencies steadily increase until all recessive alleles are eliminated.
    • C) The frequency of heterozygous genotypes continuously increases until all individuals share the same genotype.
    • D) The allele frequencies fluctuate continuously due to the genetic shuffling that occurs during meiosis.
  3. 3.

    Which evolutionary mechanism causes unpredictable fluctuations in allele frequencies within a gene pool purely as a result of chance events, exerting its most substantial effect in small populations?

    • A) Genetic drift
    • B) Directional natural selection
    • C) Gene flow
    • D) Assortative mating
  4. 4.

    Which of the following best defines the gene pool of a biological population?

    • A) The entire geographic range occupied by all reproducing individuals within an ecosystem
    • B) The aggregate of all copies of every allele at each locus across all members of the population
    • C) The complete set of observable physical phenotypes expressed under specific environmental conditions
    • D) The total number of homozygous individuals capable of surviving to reproductive maturity
  5. 5.

    In a population of 500 diploid butterflies, a single gene with two alleles controls wing pigmentation. If genetic analysis reveals 320 individuals with genotype AA, 160 with genotype Aa, and 20 with genotype aa, what is the frequency of allele A in this population's gene pool?

    • A) 0.80
    • B) 0.64
    • C) 0.48
    • D) 0.32

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