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2021-05-14

What are physical features shared by organisms with common ancestry?

What are physical features shared by organisms with common ancestry?

Homologous features Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.

What are structures which are similar in different organisms because they evolved in a similar environment yet do not have a common ancestor?

Key terms

Term Meaning
Vestigial structure Structure that is non-functional, or reduced in function
Analogous structure Structure that evolved independently in different organisms because the organisms lived in similar environments or experienced similar selective pressures
Embryology The study of embryos and their development

Which term characterizes structures that share a common ancestry?

Homologous structures

What is the modification of living organisms during their descent generation by generation from common ancestors?

Key Concepts. Evolution, also termed biological or organic evolution, is the modification of living organisms during their descent from common ancestors. Researchers of biological evolution make inferences based on fossil-record analysis, as well as phylogenetic analysis of living taxa.

What gives evidence of common descent?

Evidence for common descent comes from the existence of vestigial structures. These rudimentary structures are often homologous to structures that correspond in related or ancestral species. The existence of vestigial organs can be explained in terms of changes in the environment or modes of life of the species.

What is an example of common descent?

Some examples, include the appearance of hind limbs in whales as evidence of a terrestrial ancestor, teeth exhibited by chickens, additional toes observed in modern horse species, and the back flippers of bottlenose dolphins

Is natural selection a slow process?

Darwin thought that natural selection progressed slowly and only occurred over a long period of time. This may often be true, but it has been shown that in some cases a new species can evolve within a lifetime.