Is their a common gene in all the monkeys DNA since they are all from the same species?

Question: Is their a common gene in all the monkeys DNA since they are all from the same species?
- Keywords:
  DNA,
  gene,
  monkey,
  species
Asked by to Richard on 18 Jun 2011. This question was also asked by .
- Richard Badge answered on 18 Jun 2011:
  
  Monkeys (like baboons and spider monkeys) are all primates, like humans and so we share thousands of similar genes. They are not exactly the same, because lots of time has passed since we shared a “common ancestor” – A common ancestor is a way of saying the organism that must have exsited in the past, which if we had a perfect record of fossils, we could track all the changes that happened on the two branches of the evolutionary tree leading to say humans and baboons.
  
  A few genes have been lost and gained along the way – in general primates are able to see colour like us, but monkeys that only come out at night known as owl monkeys can only see in black and white. Also humans have many fewer working genes for olfactory receptors – the genes that help you to smell different things – as a result we have a much poorer sense of smell than chimpanzees.

Question: Is their a common gene in all the monkeys DNA since they are all from the same species?