4 ms·

I'm not a biologist, but I don't think genes are contagious

• mr_overalls 11y ago
  If they confer a selective advantage, they can quickly spread through a population: https://en.wikipedia.org/wiki/Selective_sweep https://en.wikipedia.org/wiki/Selective_sweep
• x5n1 11y ago
  Look up horizontal transfer. https://en.wikipedia.org/wiki/Horizontal_gene_transfer https://en.wikipedia.org/wiki/Horizontal_gene_transfer