CRISPR uses a guide RNA to lead a Cas enzyme, usually Cas9, to a matching DNA sequence. The enzyme cuts the DNA, and the cell's own repair process then changes the sequence.
Starter thread · AI-reviewed against its sources
The claim is a loose way of saying many human genes have distant counterparts in bananas. Estimates run from about 25% to 60% depending on method, and shared DNA is far lower, around 1%.
Starter thread · AI-reviewed against its sources
DNA comparisons, protein tests and shared anatomy all point the same way: humans sit inside the great apes, and chimpanzees and bonobos are our closest living relatives.
Starter thread · AI-reviewed against its sources
Handedness is shaped partly by many genes, each with a small effect, and partly by chance variation in early development. No single cause or left-handedness gene exists.
Starter thread · AI-reviewed against its sources
Several mutations keep the lactase gene active in adulthood. They spread after animal domestication, though why they spread so strongly in Europe is still debated.
Starter thread · AI-reviewed against its sources
