Sentence examples for could become fixed from inspiring English sources

Freud identified a series of stages in libido development beginning in infancy, and he suggested that an individual could become fixed in one of these immature stages and not pass on to the mature adult stage of sexuality, in which the chief physical mode of sexual pleasure is genital.

One possibility is that a rearrangement could become fixed in a small population via genetic drift and inbreeding (Rieseberg, 2001).

During the human-mediated breeding process, the strongly selected advantageous mutations could become fixed as these mutations increase in frequency in a population [ 11, 13].

We attribute this to the fact that recessive mutations remain hidden from selection while heterozygous, which would allow recessive disease genes to accumulate a larger number of slightly deleterious mutations that eventually could become fixed in populations.

In this way, even a chromosomal rearrangement that causes decreased fertility when heterozygous could become fixed in a population if it is linked to a strong meiotic drive allele.

Many of these are expected to be deleterious and would presumably be selected against, but others should be neutral or positively selected and could therefore become fixed in the genome [ 30].

Indeed, some of those chromosomal rearrangements could have become fixed in the population because they were directly linked to dominant beneficial characters, and would thus have undergone selective sweeps.

Waters and Storz (2009) suggest that the expression of a spurious transcript, whether cis-encoded or trans-encoded with limited complementarity to an mRNA target, could easily become fixed in a population should it provide a selective advantage to the host.

Still, the SNPs described may be beneficial mutations that we could expect to become fixed in the population after more rounds of passage.

Evolutionary rearrangements (which must, by definition, be heritable and hence occur in germ cells) represent the other side of the coin: they could not have become fixed had they been disadvantageous to individuals of the species concerned.

The smaller degree of plasticity in the tuning of zebra finch NCM could be because songs become fixed in this species: in contrast to canaries, male zebra finches learn their adult song only once (during the 1st year of life), and their song is not as complex as that of canaries.