Imagine you are trying to test whether a population of flowers is undergoing evolution. you suspect there is selection pressure on the color of the flower: bees seem to cluster around the red flowers more often than the blue flowers. in a separate experiment, you discover blue flower color is dominant to red flower color. in a field, you count 600 blue flowers and 200 red flowers. how many of the blue flowers are heterozygous?

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.