Question

17.6. describe the evidence suggesting that prehistoric hominin species reproduced with our direct ancestors.
svante pääbo, silvana condemi, and other researchers have studied both fossils and dna to provide evidence for and against modern human and neanderthal interactions. determine whether each fact is evidence for or against interbreeding between these groups.
evidence for interbreeding
drag appropriate answer(s) here
a lack of fossils found showing traits intermediate between the two species.
modern human mitochondrial dna has no neanderthal dna.
fossils from both species are found in some of the same areas.
between 1 and 4 percent of modern human nuclear dna is shared with neanderthals.
a fossil was found showing traits intermediate between the two species.
neanderthal y chromosomes have mutations that may prevent viable hybrid offspring.
the neanderthal dna in humans was introduced about 65,000 years ago.

Explanation:

• Fossils from both species are found in some of the same areas: This indicates that the two species had the opportunity to interact, which is a prerequisite for interbreeding.
• A fossil was found showing traits intermediate between the two species: Intermediate traits suggest a genetic blend, which is likely if interbreeding occurred.
• Between 1 and 4 percent of modern human nuclear DNA is shared with Neanderthals: Shared DNA implies a genetic connection, likely through interbreeding.
• The Neanderthal DNA in humans was introduced about 65,000 years ago: This timing aligns with periods when human - Neanderthal interactions could have led to interbreeding.

Answer:

• Fossils from both species are found in some of the same areas
• A fossil was found showing traits intermediate between the two species
• Between 1 and 4 percent of modern human nuclear DNA is shared with Neanderthals
• The Neanderthal DNA in humans was introduced about 65,000 years ago