Question

The color of the mustard plant in Lab 4 (Natural Selection) was determined by a single gene with two alleles (Y or y). The Y allele was dominant to y allele, and Y gave us a green plant, and yy a yellow-green plant. You measure the following genotype frequencies: YY = 0.5; Yy = 0.25; yy = 0.25. You calculate the following Hardy-Weinberg Frequencies: YY = 0.30; Yy = 0.56; yy = 0.14 This population looks like it has evolved. We can tell this because : Group of answer choices

Answer 1

Answer and Explanation:

It occurs evolution whenever the allelic frequencies in the genic pool change. If the population is not in Hardy-Weinberg equilibrium, it is because one, some, or several of the model's assumptions are not met. If we want to know if a population is evolving, we must observe the frequencies of the population, and if they change over time. If there is a change, it might also be reflected in the phenotypic frequencies.

In the exposed example there was an evident change in the population genetic frequencies.

1) Genotype frequencies: YY = 0.5; Yy = 0.25; yy = 0.25

Genic or Alleleic frequency:

• Frequency of y= f(q)= √0.25 =0.5

• Frequency of Y= f(p)= 1- 0.5 =0.5

2) Hardy-Weinberg Frequencies: YY = 0.30; Yy = 0.56; yy = 0.14

Genic or Alleleic frequency:

Frequency of y= f(p)= √0.14 =0.374

Frequency of Y= f(p)= 1- 0.5 =0.626

The allelic frequencies and hence the genotypic frequencies changes, so we can assume that there was evolution.