Acertain butterfly species has two color forms that are produced by a simple autosomal gene with complete dominance. a biologist surveys a population of these butterflies five times over two decades, and each time the proportions are 75% dominant phenotype, 25% recessive phenotype. which of the following is a reasonable inference (conclusion based on evidence) based on this information? a. the dominant phenotype is better suited to the environment than the recessive phenotype. b. two of the above answers are correct. c. this population is unstable and evolving. d. butterflies with the dominant phenotype produce more successful offspring than butterflies with the recessive phenotype. e. this population is in hardy-weinberg equilibrium

Identify the missing parts of the carbon cycle

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.

Explain why ecosystem diversity results in species diversity in a healthy biosphere