How do Beetle traits vary within the species?

well it depends if they are hetrozygous or homozygus. It could be figured out with a punnet square of 2 parent beatles such as brown could be Bb for hetrozygus and green could be gg for homozygus when u cross them it depends. the first baby would be brown and then the brown would be the dominent trait the green would disapear in the first batch of 4 beetle babies all the way the the second batch would have 3 brown and 1 green.