This phylogeny shows the relationships among 53 modern humans based on mitochondrial DNA. How does this phylogeny support the out-of-Africa hypothesis?
What will be an ideal response?
ANS:
In the out-of-Africa hypothesis, humans spread from Africa to the rest of the world. This phylogeny shows that variation in mitochondrial DNA among non-African populations is a subset of the variation that exists in Africa. Thus, worldwide populations must have originated from African populations.
You might also like to view...
When atoms gain or lose electrons, they become negatively or positively charged. These negatively or positively charged atoms are known as
A. isotopes. B. ions. C. isomers. D. unstable atoms.
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. B. They have thick, tough secondary walls. C. Their secondary walls may be impregnated with lignin. D. They form fibers and sclereids. E. They lack living protoplasts when mature.
The enzyme that breaks down acetylcholine within the synaptic cleft is
A. GABA. B. maltase. C. monoamine oxidase. D. lipase. E. acetylcholinesterase.
Cells use exocytosis to
A) ingest nutrients. B) pump hydrogen molecules across the membrane. C) create new cells. D) release substances from the cell. E) move away from danger.