The biological “speed of light” by comparing the genomes of parents and their children, the team was able to measure how frequently new mutations occur and are passed down Our results suggest that the prevalent 343 negative correlation between generational mutation rates and population size (16, 17, 20, 26), is 344 more parsimoniously explained by developmental variations accompanying lineage divergence 345 than by recurrent selective adjustments of molecular mutation rates in response to demographic 346 changes. Jorde explains that this mutation rate is as fundamental to human biology as the speed of light is to physics.
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The combination of technologies increased the researchers’ ability to evaluate all types of variations while analyzing the family’s dna codes.
The rate at which mutations arise can be estimated by studying multigenerational human families
Reference genomes have been assembled for 28 people from four generations of the same family. Background short tandem repeat (str) mutations are major drivers of genetic variation and deeply influence phenotypic diversity and evolution, they are often overlooked despite their significant effects Author summary in settings such as bacterial infections and cancer, cellular populations grow exponentially Dna mutations acquired during this growth can have profound effects, e.g
Conferring drug resistance or faster tumour growth In mathematical models of this fundamental process, considerable effort—spanning many decades—has been invested to understand the factors that control two. We then use these data to explore how the mutation spectrum might evolve as a function of biological variables like reproductive life history, testing the predictions of several key hypotheses about the origin and evolution of germline mutations Results standardizing the mutation spectrum for genome composition and genetic diversity
