Certification. If a sonographer has obtained education through a college or university, the sonographer must pass an exam in order to get their certification. Some states require that ultrasound technicians be licensed, which requires them to hold current certification.
diploid â(not comparable) (cytology) Of a cell, having a pair of each type of chromosome, one of the pair being derived from the ovum and the other from the spermatozoon. Most somatic cells of higher organisms are diploid.
Diploid human cells have 2 sets of 23 chromosomes for a total of 46 chromosomes: By Regina Bailey. Definition: A haploid cell is a cell that contains one complete set of chromosomes. Gametes are haploid cells that are produced by meiosis.