CHOOSE THE BEST ANSWER What molecule is the physical link between the codon in the mRNA and its corresponding amino acid?

______________ are thought to be a major explanation for rapid macroevolutionary change observed in the fossil record (i.e., patterns of punctuated equilibrium).

In a species of mice, one gene with two incompletely dominant alleles (B, b) influences coat color: BB individuals are blackBb individuals are brownbb individuals are white Researchers studying an isolated population of these mice counted 150 black mice, 100 brown mice, and 250 white mice. Using this information, answer the following questions. What is the frequency of observed genotypes?  What is the frequency of the b allele? Based on their observations, the researcher concluded that the coat color gene in this mouse population…  

Which of the following are required for the evolution of reciprocal altruism? Select two correct answers.

This phylogenetic tree depicts the evolutionary relationships of eight major vertebrate classes.  Tiktaalik is an intermediate fossil that represents an early ancestor of all tetrapods. Specifically, Tiktaalik is known for its wrist, a key feature of the tetrapod limb that made it possible for which major evolutionary transition in animals? If you were to add Tiktaalik to this phylogeny, where would the Tiktaalik branch extend from?

The “Out-of-Africa” hypothesis—that the human species originated in Africa and later spread around the world—makes several testable predictions about the distribution of human fossils and genetic variation. What result below would NOT support the “Out-of-Africa” hypothesis?

Which statement is true about sexual selection?

Australian Marsupials have been geographically isolated from Placental mammals for ~50 million years. In that time, many species in both groups have independently evolved the same adaptations via convergent evolution. The analogous adaptations observed in Placental mammals and Marsupials are best explained by…

Which of the following are required for the evolution of reciprocal altruism? Select two correct answers.

Following selection, 80% of individuals with the “AA” genotype survive, all “Aa” individuals survive and 40% of “aa” individuals survive. Their respective relative fitnesses are…