crepsis Posted April 30, 2008 Share Posted April 30, 2008 Some insects such as cockroaches, grasshoppers, and crickets have only one type of sex chromosome: X. This means that male and female cockroaches have a different number of chromosomes. This is very different from most organisms, which have either X and Y sex chromosomes (most people are familiar with these) or W and Z sex chromosomes (birds and some insects use these for sex determination). Females have two of the same sex chromosomes (XX) Males have just one sex chromosome (X0) <---The 'zero' is a place marker, it means that there is no second X chromosome there. Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.