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.
Thus, diploid cells are those which contain a complete set (or 2n number) of chromosomes whereas haploid cells are those that have half the number of chromosomes (or n) in the nucleus. In plant cells, the haploid or n stage constitutes a large part of the life cycle.