Hardy-Weinberg Equilibrium and Plant Genetics

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All of the following problems refer to a plant gene that has two alleles: B and R. BB genotypes have blue flowers, BR genotypes have purple flowers, and RR genotypes have red flowers.

1. In a population of 230 plants, 124 have blue flowers, 51 have purple flowers, and 55 have red flowers. Calculate allele frequencies for this population.

2. Suppose that you knew that there were 100 plants with purple flowers out of a population of 340. Can you calculate allele frequencies? If not, what information would you need to calculate allele frequencies.

3. In spring of 2013, you census a population of plants: 60 have blue flowers, 60 have purple flowers, and 30 have red flowers. Summer and fall 2013 experience a severe drought. In spring of 2014, you conduct another census of the population: 80 plants have blue flowers, 80 have purple flowers, and 40 have red flowers. Has microevolution occurred? Why or why not?

4. In a population, 70 plants have blue flowers, 105 have purple flowers, and 5 have red flowers. Is this population in a Hardy-Weinberg equilibrium? Demonstrate your answer by calculating allele and genotype frequencies.

5. Suppose that a population of plants is in Hardy-Weinberg equilibrium. The total population is 140 plants, and there are 40 plants with blue flowers. Calculate allele and genotype frequencies.

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