When the alleles for a given trait are identical, the organism is said to be homozygous with respect to that gene, and the appearance of the corresponding trait is assured.
Natural selection is generally expected to favor one form of a given trait within a population.
Evolutionary adaptationists tend to ask, of any given trait, what effect might have led natural selection to favour that trait.
Economic values or weights measure the net economic gain per unit genetic increase of a given trait.
Each of them measures the extent to which the respondent believes he/she resembles the description of a given trait.
The degree of such G × E interaction can be estimated using the genetic correlation (rg) between measurements in two environments for a given trait.
However, specific life events may alter the magnitude of genetic expression on a given trait, or it may in fact instigate different genetic processes altogether.
In addition, if the heritability and selection differential for a given trait are known, the evolutionary response can be predicted using the simple equation R = h2s.
QTL analyses performed under multiple environmental conditions and using different genetic interaction analyses might also generate redundant QTL information associated with a given trait.
They believe that for a given trait to be "genetic," there must be a fixed, immutable relationship between genotype and phenotype.
For example, students' conceptions about which cells in an organism possess genes for a given trait can be remedied during instruction (Makarevitch et al. 2015).
