From the above, after a time t of neutral evolution the frequency of a double mutant relative to a single one is 1-e−tu 2e−3tu/[ 1-e−tu e−4tu]] = etu-1, 1-e−tu 2e−3tu/[ 1-e−tu e−4tu] 1-e−tu 2e−3tu/[ 1-e−tu e−4tu]
At the moment that selective pressure is first applied, there may be standing variation allowing for the possibility that the first successful beneficial variant could be a double mutant relative to the ancestral type.
We assume that double-mutant colony size can be used as an approximation for the number of double mutants produced by the original meiotic event and hypothesize that, in the absence of genetic linkage, just like in the absence of genetic interactions, the colony size of a double mutant, relative to wild type, should be equal to the product of the two single mutant colony sizes (f ij = f i × f j).
Plentiful CO2 helps plants use water more efficiently, and atmospheric levels of CO2 are expected to double, relative to preindustrial times, by 2050.
To explore this issue further, we have repeated our main analyses with modified SDS in which the implementation items (i.e., relating to communication, motivation and strategy realization) were weighted double relative to all other items.
We show that in certain corona algebras, σ-unital hereditary subalgebras have the property that their double relative commutant in the corona algebra is equal to the unitization of the given hereditary subalgebra.
For example, we saw seed prices more than double relative to the price received for agriculture commodities between 1990 and 2010.
Under-5 deaths among children of mothers in the most disadvantaged UADI quintiles (class V) were double relative to under-5 deaths among children of mothers in the least disadvantaged UADI quintile (class I; OR = 2.14; 95% CI, 1.11 4.12).
12 The risk of gastrointestinal bleeding remains elevated with longer duration of ASA treatment 13; indeed, the risk of gastrointestinal bleeding after 1 year of ASA use is more than double relative to non-users.
By 2050, wrote Elsie M. Sunderland and colleagues, mercury levels in the North Pacific could double relative to 1995 levels if anthropogenic emissions remain at their present levels, including coal use in Asia.
In developed countries, immunological non-responders also have an approximately doubled relative risk of clinical progression to AIDS compared to patients with an adequate response [10], although a study conducted in our own clinic could not confirm these findings in a resource-limited setting [11].
