Question

In four o’clock plants, there are three phenotypes for flower color but only two alleles. In one population, q2 = 0.169, and the population is assumed to be in Hardy-Weinberg equilibrium. The table below shows the number of plants of each phenotype that are expected in a population of 1,000 plants in the next generation.

Phenotype
Number expected
Red flowers
105
Pink flowers
484
White flowers
411

In the next generation, what p value is expected?
0.105
0.411
0.516
0.589

Answer 1

Answer:

P value is expected to be 0.589

Explanation:

In the most basic case, we have a single gene with only two alleles. These alleles could be A and a, as well as A1 and A2. Assume that A or A1 is tall and A or A2 is short. Don't worry about whether the alleles are dominant, recessive, or co-dominant for the time being. In a population, they will have p and q frequencies. (Because there are only two options and they must sum to 100%, p + q = 1.)

We can predict genotype frequencies if we know the allele frequencies. As shown, the expected genotype frequencies of the two alleles are calculated. This should look familiar: it's our old pal Punnet's Square.

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