The Results of the Lenski and Travisano Experiment on Cells

question 20

Multiple Choice

The results of the Lenski and Travisano experiment on cells in 12 replicate lines of E.coli illustrate the fact that

• A)evolution by natural selection is sometimes significantly affected by chance events, such as random mutations, and the order in which they happen.
• B)evolution by natural selection is often a predictable, repeatable process.
• C)A and B
• D)None of the above

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Definitions:

Mitochondrial DNA

Genetic material found in mitochondria, the energy-producing structures within cells, inherited almost exclusively from the mother.

Ancestral Allele

The original version of a gene that existed in a common ancestor of a species or a group of species.

EPAS1 Allele

A genetic variant associated with adaptation to high-altitude environments, often studied in populations living in the Himalayas.

Denisovan Genome

The genetic blueprint of the Denisovans, an extinct species of archaic humans, obtained from ancient DNA samples.