Sentence examples for molecular clock have from inspiring English sources

Previous studies assuming a global molecular clock have suggested that the Bacillariophyceae clade evolved in the Early Cretaceous (approx. 135 Ma) and as early as in the Middle Triassic (approx 240 Ma; [29], [69], [70]).

Furthermore, recent studies have shown that mice with a blood vessel-specific deletion of peroxisome proliferator-activated receptor-γ (PPARγ), a nuclear receptor transcription factor that both acts as a lipid sensor and interacts with the molecular clock, have disrupted diurnal BP rhythms.

Models for estimating divergence times under a molecular clock have become more complex over the past two decades.

The rate of nucleotide substitutions is not constant across the Tree of Life, and departures from a molecular clock have been commonly reported.

While significant deviations from molecular clock have been found in many taxa, effects of life histories on molecular evolution are not fully understood.

Various substitution models that relax the assumption of the strict molecular clock have been developed to account for rate heterogeneity between lineages in molecular phylogenetics (e.g., Thorne et al. 1998; Sanderson 2002; Drummond et al. 2006).

Already the molecular clock has yielded interesting findings.

But because the molecular clock has to be calibrated with fossil dates, there's plenty of room for disagreement.

Since 1998 (SanMiguel et al. 1998), analysis of sequence divergence between paired LTRs from intact LTR-RTs, coupled with a molecular clock, has been the accepted method used to estimate the insertion times of LTR-RTs in plant genomes.

This supposedly better molecular clock has pushed back several important dates, such as when the ancestors of humans and chimps split and the exodus of modern humans out of Africa.

As yet, it's not known how recombination changes mitochondrial DNA, says Shron, so it's too early to say whether the molecular clock has been running fast or slow.