Figuer:
-SIV causes symptomless infections in monkeys and apes,yet causes AIDS-like disease in chimpanzees.HIV is closely related to SIV and causes AIDS in humans.Which of the following is the best explanation for these observations?

Question

Figuer: 
-SIV causes symptomless infections in monkeys and apes,yet causes AIDS-like disease in chimpanzees.HIV is closely related to SIV and causes AIDS in humans.Which of the following is the best explanation for these observations?

Quizplus · Accepted Answer

The fact that SIV causes different outcomes in different primate species (symptomless infections in some and AIDS-like disease in others) suggests that there may be genetic differences between these species that make them more or less susceptible to the virus. The fact that SIV is closely related to HIV and causes AIDS in humans, while causing only symptomless infections in some closely related primate species, suggests that there may be genetic differences between humans and those primate species that make us more susceptible to the virus. One explanation for these genetic differences is that chimpanzees and humans have a more recent common ancestor than humans and other primate species, and thus share more genetic similarities and susceptibilities.

Figuer: -SIV Causes Symptomless Infections in Monkeys and Apes,yet Causes AIDS-Like