Final answer:
To determine how many of the 280 flowers are blue, calculate 35% of 280. For the genetic structure and microevolution analysis, the Hardy-Weinberg principle is used to compare observed and expected genotype frequencies based on the dominance of blue flower color and the counts of blue and red flowers.
Step-by-step explanation:
If 35% of the flowers are blue and there are 280 flowers, to find out how many are blue, you would simply calculate 35% of 280. This is done by multiplying 0.35 (which is 35% expressed as a decimal) by 280, resulting in 98 blue flowers.
When evaluating whether a population of flowers is undergoing microevolution, we need to consider the allele frequencies and the genetic structure based on the observed number of blue and red flowers. If we count 600 blue flowers and 200 red flowers, and we know blue flower color is dominant, we'd use the Hardy-Weinberg equation to find the expected genotype frequencies for a population in Hardy-Weinberg equilibrium. To determine if the population is evolving, we would compare the actual counts to the expected counts under no evolution.
In our scenario, based on the Hardy-Weinberg principle and the given data, you would expect the genetic structure to have a certain proportion of homozygous dominant, heterozygous, and homozygous recessive individuals. The exact expected ratios would depend on the initial allele frequencies, which would need to be calculated from the given phenotype frequencies and dominance relationships.