Many people are. In fact, the ability to digest lactose may be an example of adaptive evolution in the human lineage. Although the study of natural selection in humans is still in an early stage ...

Evolution is an ongoing phenomenon in human populations around the world ... genetic drift and natural selection. Genetic drift refers to random fluctuations in the frequencies of certain genes ...

Darwin thought that evolution took place over hundreds or thousands of years and was impossible to witness in a human lifetime ... The Grants had documented natural selection in action.

Physiological traits that help Tibetan women survive at high altitudes are being selected for within the population, meaning ...

Natural selection is the process by ... Nowadays there is also a new force in evolution: humans. We are exerting new selection pressures on many species, changing them in unpredictable ways.

For example, if heterozygotes at a locus have higher fitness than homozygotes (a scenario known as heterozygote advantage or overdominance), natural selection will maintain multiple alleles at ...

Scientists have come up with scenarios through ... and complexities to form the human eye, with its many parts and astounding abilities. Through natural selection, different types of eyes have ...

Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes ...