EXTRA CREDIT QUESTION: What is a normal gingival sulcus depth for a feline?

Which lab finding in an HIV-positive client should be reported immediately?

The Müller’s ratchet hypothesis to explain sex suggests that…

Two species of fruit fly found on the island of Melanesia are morphologically indistinguishable.  The two species share habitats but rarely interbreed in the wild. Males of both species court females from both species, but the females have a strong preference for the courting display of males of their own species. Based on this information, fruit fly courtship would be considered a form of , which occurs .

Based on the biological definition of sex, what is the single character that distinguishes females from males?

Which statement is true about sexual selection?

______________ 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…  

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?

Which statement is true about sexual selection?