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Gene pools and allele frequencies

Biology • Population Genetics • Knowledge-Based • 5 questions

Gene pools and allele frequencies Knowledge-Based Download PDF

Biology · Evolution · Biology · Population Genetics

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

Questions

  1. 1.

    Why must the sum of the relative frequencies of all alternative alleles at a specific gene locus in a population's gene pool always equal 1.0 (or 100%)?

    • A) Each diploid individual in the population is genetically required to possess one copy of every existing allele.
    • B) The identified alleles together account for all copies of that specific gene locus present across the entire population.
    • C) Dominant alleles systematically replace recessive alleles over time to maintain steady phenotypic proportions.
    • D) Natural selection consistently maintains equal frequencies among all competing alleles within a gene pool.
  2. 2.

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

    • A) The aggregate of observable physical characteristics and traits expressed by all organisms within a community
    • B) The sum of all alleles for all gene loci present in all individuals of an interbreeding population
    • C) The collection of only the dominant alleles that are actively expressed and transmitted to the next generation
    • D) The complete set of chromosomes found within the nucleus of a single representative organism
  3. 3.

    When every individual in a diploid population is homozygous for the same allele at a particular gene locus, what is the frequency of that allele in the gene pool, and what term describes this status?

    • A) The frequency is 0.50, and the allele is considered polymorphic.
    • B) The frequency is 0.00, and the allele is considered neutral.
    • C) The frequency is 0.75, and the allele is considered dominant.
    • D) The frequency is 1.00, and the allele is considered fixed.
  4. 4.

    A diploid population consists of 100 individuals: 50 are homozygous dominant (AA), 30 are heterozygous (Aa), and 20 are homozygous recessive (aa). What is the frequency of the recessive allele (a) in this gene pool?

    • A) 0.20
    • B) 0.50
    • C) 0.70
    • D) 0.35
  5. 5.

    In population genetics, what does an allele frequency represent within a population's gene pool?

    • A) The proportion of a specific allele relative to the total number of all alleles for that gene locus in the population
    • B) The percentage of individuals in the population that express the corresponding physical trait
    • C) The ratio of dominant alleles compared to recessive alleles across all chromosomes in an organism
    • D) The total count of homozygous individuals divided by the total count of heterozygous individuals