Abiologist measures the allele frequencies of pea plants in a very controlled environment. the plants can either have a dominant tall allele (t) or a recessive short allele (t). which of the following is a reason that this population is not at hardy-weinberg equilibrium?

a. the pea plants are mated at random.
b. both alleles ensure equal survival.
c. one pea plant mutates to have a new allele.
d. every pea plant reproduces exactly once.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

How is the carbon cycle related to global warming ?

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)