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: Autosomal chromosomes: 22 sets of 2. Sex chromosomes: 1 set of 2. Haploid Cell Reproduction. Haploid cells are produced by the process of meiosis. In meiosis, a diploid cell divides twice to produce four haploid daughter cells. Prior to the start of the meiotic cell cycle, the cell replicates it DNA and increases its mass and organelle numbers in a stage known as interphase.