Sequencing DNA has come down in price by half annually, from $10 per base pair in 1990 to under a penny today.资讯科技通常不要一年，价格表现比和产能就会增加一倍。
The base pair ratio, AT:GC, is constant within a species but differs between species.AT:GC之间的碱基比具有种内特异性，但在不同种之间往往是不同的。