Hardy–Weinberg equilibrium Knowledge-Based Practice

Questions

1. 1.

   Under the Hardy–Weinberg principle for a gene with two alleles, at what frequency of the dominant allele does the proportion of heterozygous individuals reach its theoretical maximum?

   • A) 0.25
   • B) 0.75
   • C) 1.00
   • D) 0.50
2. 2.

   A biological population of 500 diploid organisms contains 200 individuals of genotype BB, 100 of genotype Bb, and 200 of genotype bb. If this population were in Hardy–Weinberg equilibrium, how many individuals would be expected to have the heterozygous genotype (Bb)?

   • A) 100
   • B) 125
   • C) 200
   • D) 250
3. 3.

   In a diploid population that is in Hardy–Weinberg equilibrium for a gene with complete dominance, the frequency of the dominant allele is 0.8. What proportion of the population is expected to exhibit the dominant phenotype?

   • A) 0.32
   • B) 0.64
   • C) 0.80
   • D) 0.96
4. 4.

   Which of the following conditions is necessary for a biological population to remain in Hardy–Weinberg equilibrium for a specific gene locus?

   • A) Preferential mating among individuals with similar physical characteristics
   • B) A sufficiently small population size subject to fluctuations from genetic drift
   • C) The complete absence of natural selection favoring or disfavoring particular genotypes
   • D) A steady rate of net gene flow carrying alleles into and out of the gene pool
5. 5.

   In a randomly mating diploid population that is in Hardy–Weinberg equilibrium, an autosomal recessive condition is expressed in 4% (0.04) of individuals. What is the expected frequency of heterozygous carriers in this population?

   • A) 0.08
   • B) 0.16
   • C) 0.20
   • D) 0.32

Answers and step-by-step solutions appear after you finish the test.