Interspecific competition may prevent a population from evolving through crossing fitness valleys or adaptive ridges if it requires many generations to achieve peak shifts.
This interpretation requires very long timescales, as it requires many generations of agents before equilibrium is reached.
Nonetheless, the conversion (evolution) of the actinomycete genes into functional enterococcal genes likely would have required many generations of growth under constant selection, and any intermediate stages in this process are a matter of speculation; however, once established on conjugative transposons, the genes would be readily disseminated (17, 29 ).
In Drosophila, full-sib mating is such a scheme, but it can require many generations to achieve theoretical genome-wide homozygosity.
Simultaneous evaluations like Case 1 do not require many generations to reach convergence and it is easy to use the system because three parameters are evaluated simultaneously.
Crossbreeding requires many generations, and in that time however long it may be the seas will have grown that much warmer and more acidified.
To pyramid several new QTLs, stepwise crossing schemes can be designed, although such schemes can require many generations of breeding.
The questionnaire results showed that both feelings of tiredness and ease of making choices were slightly higher for Case 2. Therefore, while individual evaluations were considered easier than simultaneous evaluations, on the other hand, individual evaluations require many generations to reach convergence.
Instead, the builder is saddled with the onerous task of packing the brain with a mountain of instincts (something that will require many generations of future scientists to unpack, as they struggle to build the teleome), and somehow managing to encode all that wisdom in the fine structure of the brain's organization.
First and most important, gene drives require many generations to spread through populations.
Rapid changes in salinities would make acclimatization difficult and would be even less favorable to adaptation that might require many generations.
