provides funding as a founding partner of The Conversation US.The is a short take about interesting academic work.The sperm of older rats differs from that of younger rats in ways that may affect embryo development, according to recently published research.Sperm carries not only genes, but also instructions that determine which genes will be turned on or off in offspring. These directions are known as .In the rats we studied, age had a profound effect on the activity of many genes in sperm. We found age affected two epigenetic mechanisms in particular: , which chemically alters DNA to block...…provides funding as a founding partner of The Conversation US.The is a short take about interesting academic work.The sperm of older rats differs from that of younger rats in ways that may affect embryo development, according to recently published research.Sperm carries not only genes, but also instructions that determine which genes will be turned on or off in offspring. These directions are known as .In the rats we studied, age had a profound effect on the activity of many genes in sperm. We found age affected two epigenetic mechanisms in particular: , which chemically alters DNA to block...WW…