Scientists observe a newly established population of sexually reproducing plants growing on the shore of a small island. An observable trait of the plant has two possible phenotypes. It is determined by a single gene, with the dominant allele having complete dominance over the recessive allele. The first generation had 26 plants with the dominant trait and 25 with the recessive trait. The data below is from the first six generations of this population:
Use the data to explain the changes in phenotypic frequency from generation 1 to 3. I'm not sure how to explain the increase in the recessive trait for generation $2$ to $3$. How would a population go from $p^2+2pq=1$ to $q^2 \simeq .2$?
Do you think this population is in Hardy-Weinberg equilibrium? Support your answer. No, I don't believe so, since the population seems to change constantly in both the total number in the population, as well as the number of individuals with each trait.
Propose a possible explanation for the change in phenotype frequency from generation 5 to generation 6. Perhaps a climate change or the introduction of some new factor such as a drought or new preadator?