Achild had sickle-cell disease but niether parent is ill. what must be true of her parents genotype

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.