A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block base pair to a large segment of a chromosome that includes multiple genes. When an egg and a sperm cell unite, the resulting fertilized egg cell receives DNA from both parents. If this DNA has a mutation, the child that grows from the fertilized egg will have the mutation in each of his or her cells. These changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if an error is made as DNA copies itself during cell division.
No single gene associated with being gay
GAN gene: MedlinePlus Genetics
Awarded a Nobel Prize for his work unravelling the double-helix structure of DNA while still a young man, the geneticist went on to be a leading light in the molecular biology revolution that followed. He has led major research institutions and spearheaded the Human Genome Project , which successfully mapped the spread of human DNA for the first time. Sadly, in recent years his achievements have been overshadowed by a series of controversial remarks made in public and to the press that have been viewed as racist, sexist and homophobic. The conversation about Dr Watson has been rekindled by a new warts-and-all documentary on PBS examining his incredible life, while also challenging him on some of his most controversial statements. Chicago-native Dr Watson has always been a divisive figure. While the pair later became friends, the renowned biologist E. Wilson once described him as "the most unpleasant human being I had ever met".
The Gay Gene: New Evidence Supports an Old Hypothesis
A new Scientific Reports study looking into the links between homosexuality in men and their genes has made a fascinating discovery: Two regions on two chromosomes do indeed seem to be different in gay men compared to heterosexual men. The authors of the new study — led by geneticists and psychiatrists from the NorthShore University HealthSystem Research Institute — point this out early on. Using 1, self-identified homosexual and 1, self-identified heterosexual men of primarily European descent, they conducted a genome-wide association study , or a GWAS. This means they looked for differences in the genetic constituents of their subjects across their entire genome.
How do genes influence our sexuality? The question has long been fraught with controversy. An ambitious new study — the largest ever to analyze the genetics of same-sex sexual behavior — found that genetics does play a role, responsible for perhaps a third of the influence on whether someone has same-sex sex. The study of nearly half a million people, funded by the National Institutes of Health and other agencies, found differences in the genetic details of same-sex behavior in men and women.