The researchers suggest a deep tone of voice in a man is comparable to a peacock’s tail – it has no survival value, but attracts the female of the species. It really is testosterone which masculinizes the tone of voice at puberty. Related StoriesProstate Cells Undergo 'Reprogramming' TO CREATE Tumors, Study FindsStudy shows restoring testosterone production in men will not impact their fertilityNew assessment tool under development might help detect physical traits of Klinefelter syndromeThe researchers led by David Feinberg, assistant professor in the Section of Psychology, Neuroscience and Behaviour at McMaster University and Coren Apicella studied the Hadza tribe in Tanzania that have been chosen because their way of living reflects those of humans thousands of years ago.Kari Band, M.D., shown data on the prevalence of germline mutations in Lynch Syndrome and other cancer predisposition genes in 381 patients with endometrial cancers. DNA mutations in 25 tumor genes were recognized using the myRisk Hereditary Tumor test. The data showed that 35 patients had a deleterious mutation. Of the, 22 sufferers had a deleterious mutation in LS genes and 13 patients had a deleterious mutation in non-LS genes, which represents a 59 % upsurge in the number of individuals identified with mutations using myRisk. Outcomes for endometrial cancers with a deleterious mutation in LS genes had been similar to previous findings.