On the island of saba in the caribbean, there are land crabs that live in the forests and come out at night to forage for food (this is true, they are big and also very cool.) in one particular park, there is a population of 60 land crabs. 40 of them are blue and the other 20 are red. this trait is controlled by alleles at a single locus. which of the following statements about this population of crabs is true?
a. blue crabs can either be homozygous dominant or heterozygotes.
b. the red crabs exhibit the recessive phenotype.
c. shell color in this population can evolve.
d. all of these statements are true.

c. Shell color in this population can evolve.

Explanation:

The presence of genetic variation is one of the foremost requisite for the process of evolution. Given that the population of the land crab exhibits genetic variation with respect to their coat color, the trait can undergo evolution.

For example, the population can evolve into the one having the coat color better suited under the prevailing or changed surroundings.  

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.