Describe the role that sonogram machines have played in increasing gendercide

Sonogram machines permit to know the gender of a baby while it is in the womb.

There are some parents that want a child with a specific gender, and when, thanks to the sonogram machine, they know that their baby will be a gender that they do not want, the may proceed to do an abortion, this would be called "gendercide" because the causative of this decision is the gender of the unborn baby.