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.
The sets of chromosomes of diploid and haploid cells are expressed in terms of haploid numbers and diploid numbers. A haploid number is the amount of chromosomes inside the nucleus of one chromosomal set. A diploid number concerns the nuclei of two chromosomal sets.