In addition to comparing heat-tolerance among the three populations, we investigated whether heat-tolerance was different among size classes within each population for further insight into the presence of selection pressure
for this trait.
The argument that women will get wiped out in a few generations because of skewed sex ratios produced by selection pressure
for boys holds little water.
We have to look at this in terms of worldwide issues such as use of antibiotics and selection pressure
for resistant organisms.
The researchers note that "biological models suggest that selection pressure
often works against organisms that are too harmful to their hosts.
This paper highlights the variable intensity of selection pressure
It is unknown what selection pressure
favored bipedal locomotion.
Moreover, development in brain size in Homo Habilis, as well as in modern chimps, far exceeds any environmental selection pressure
, rendering suspect a Darwinian explanation of this growth.
Working in collaboration with Karl Pearson, Weldon for the first time proved that adaptive natural selection was currently at work on a population by correlating deviation from an expected distribution of a trait, the width of crabs' front end, with an adaptive cause, the silting up of Plymouth Bay, which generated selection pressure
for decreased frontal breadth.
As long as the same drench is used, selection pressure
in favour of the resistant worms continues.
Book selection pressure
on school library media specialists and teachers.
Huxley was not recommending that absurdity; indeed, he warned of the consequences of humanity's escape from the ordinary forms of selection pressure
, the consequences of overpopulation and ecosystem collapse.