Question

Refer To The Figure. Examine This Phylogenetic Tree Of Immunodeficiency Viruses. Based On The Figure, Which Statement About HIV Is True? HIV-2 Is More Closely Related To SIV From Than It Is To SIV From Sykes Monkeys Than It Is To SIV From African Green Monkeys. All HIV Variants In Humans Were Derived From Viruses In Chimpanzees. HIV-2 Is More Closely

Answer 1

HIV-2 is more closely related to SIV from Sykes monkeys than it is to SIV from African green monkeys. All HIV variants in humans were derived from viruses in chimpanzees.

Step-by-step explanation:

Based on the phylogenetic tree of immunodeficiency viruses, the statement that HIV-2 is more closely related to SIV from Sykes monkeys than it is to SIV from African green monkeys is true. This can be seen by examining the branches of the phylogenetic tree and noting the shorter distance between HIV-2 and SIV from Sykes monkeys compared to the distance between HIV-2 and SIV from African green monkeys.

Regarding the statement that all HIV variants in humans were derived from viruses in chimpanzees, this is also true. It is widely accepted by researchers that the transmission of SIV from chimpanzees to humans led to the emergence of HIV in humans.

Answer 2

HIV-2 originated from cross-species transmission and is closely related to specific SIVs. HIV's rapid mutation rate illustrates ongoing evolution, with sub-Saharan Africa facing the highest prevalence due to lack of treatment options.

Step-by-step explanation:

Based on the provided information, the true statement about HIV is that it originated from cross-species transmission, with HIV-2 being more closely related to SIV from certain monkey species than to other strains of SIV. HIV is a pandemic affecting millions of people globally, particularly in sub-Saharan Africa.

The Human Immunodeficiency Virus is known for its rapid reproduction rate, which can lead to drug-resistant strains within weeks, illustrating that evolution is an ongoing process. Additionally, the high prevalence of HIV in sub-Saharan Africa is linked to a lack of prevention strategies and treatments.