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.
Haploid cells are cells that contain only one complete set of chromosomes. The most common type of haploid cells is gametes, or sex cells. Haploid cells are produced by meiosis. They are genetically diverse cells that are used in sexual reproduction. When the haploid cells from the parent donors come together and are fertilized, the offspring has a complete set of chromosomes and becomes a diploid cell. A haploid cell with have a haploid number, which is the number of chromosomes found within the nucleus that create one set. In humans, the haploid cells have 23 chromosomes, versus the 46 in the diploid cells. There is a difference between haploid and monoploid cells. Haploid cells have one complete set of chromosomes, whereas the term monoploid refers to the number of unique chromosomes in a biological cell. In diploid organisms, diploid cells contain the complete set of necessary chromosomes, while haploid have only half the number of chromosomes found in the nucleus.