Example of a human karyotype: 23 pairs of homologous chromosomes (one pair is the homologous 'sex' chromosomes - in this case X and Y = a boy) III. Meiosis reduces chromosome number from diploid (2n) to haploid (n) 1 diploid cell (2n) cell becomes 4 haploid (n) germ cells (eggs or sperm).
closed plan. noun. 1. an office floor plan consisting of fully enclosed office spaces. Compare open plan.
NIOSH, in response to the need for a working model as to what a âclosed systemâ and what a âclosed system drug transfer deviceâ was, provided the following definition: A closed system is a device that does not exchange unfiltered air or contaminants with the adjacent environment. This closed system definition originally referred to a biological safety cabinet and not to the drug containment devices. A drug containment device is one that is both airtight and leakproof.