A possibility for why intimate reproduction is unremarkably a better method for transfer genes than asexual reproduction has hit documentation . In the mental process , scientists have gain ground another cock to help them search for genetic disease variation .
One theory view as that the shamble of chromosome from genetically unlike parent helps us doa better chore at fighting off parasites . A related approximation is that a more divers genome is beneficial for responding to exchange environmental conditions .
Now , one long - stand account has received empiric supporting . The deleterious sport surmisal proposes that when an mortal of an nonsexual species has a mutation , that gene will be passed on to all its offspring . Sincemost mutations that castrate proteins are harmful , this would not be good for the survival of the line . However , in sexual facts of life , some offspring will have more sport and others less . The one with few mutation will generally fly high while those with more tend to die out , proceed the universe as a whole healthy .
However , even mathematical models fabricate by the leading advocate of the hypothesis take an average of more thanone unexampled injurious mutationper individual if sex is to provide a welfare . The evidence for whether living species actually pit this charge per unit remains challenge .
InNature Genetics , Dr. Philip Awadalla of the University of Montreal has supply powerful newfangled evidence for the deleterious mutation hypothesis . perverse to mellow school day genetic science classes , parental genomesdo not recombine evenly . Some segmentscombinefrequently , while others only once in many generations .
If the hypothesis is correct , then the parts of our genome that rarely combine should have more mutations . This is indeed what Awadalla found . genetic mutation build up up from parent to child on these stretches of chromosome until recombination at long last take place . “But since these mutations rest on less dynamic segments of our genome , the process can potentially take many hundreds of generations , " Awadalla say .
By describe the parts of the genome that rarely combine , Awadalla is provide scientists seeking transmitted disease genetic mutation a suggestion on the best places to set forth look . Rather than having to hunt through the entire human genome , researchers can sharpen on behind - unite “ coldspots ” which make up a third of the genome and are most potential to harbour mutations . Awadalla also notice that mutations in the coldspots lean to be more serious than those elsewhere in the genome .
The study was done with genomes from four human populations , and found that the difference between coldspots and rapidly unite regions was smaller for masses of African than European stock . harmonize to the authors , this demonstrates that new survival pressures can change the pep pill at which variation are slay over short evolutionary periods .
