have a more pronounced influence on Ne than periods of larger population size. Natural selection can produce genetic variation among demes within a metapopulation if different selective pressures ...

We have little understanding about the evolutionary forces that influence the genes ... of ecological measurements of selection in natural environments with population genetic analysis of cloned ...

They had just completed a survey of the lizard population immediately ... s likely that the common agents of natural selection will shift toward those which influence survival during these ...

Second, population size matters. Larger populations are likelier to have at least one individual with mutations that affect survival or reproduction. Natural selection then either weeds these out ...

The first event that the Grants saw affect the food supply was a drought ... The Grants had documented natural selection in action. While beak size is clearly related to feeding strategies ...

It all comes down to natural selection, or the process by which ... It wasn't until Darwin read about economist Thomas Robert Malthus' population theory, which promoted the idea of "survival ...

"A tumor cell population is constantly evolving through natural selection," says Carlo C ... The final condition is that the variation has to affect fitness, the survival and reproduction of ...

Presumably, different mutations were available in each population for natural selection to work on ... Suppose there are a hundred genes that affect height (about 50 are known already, and ...

For the first time, an international study has deciphered the genome of the population of Brazil. Published in the journal ...

In fact, natural selection often leads ... Such events would slash the population size of species that survive, weakening selection and increasing the chances of greater genomic complexity arising ...

Here’s how it works. Natural selection, the evolutionary process that guides which traits become more common in a population, has been acting on us for the past 3,000 years, right up to the ...