There are almost as many different types of four-wheel-drive systems as there are four-wheel-drive vehicles. It seems that every manufacturer has several different schemes for providing power to all of the wheels.
Human Male Chromosomes. In the normal karyotype of male chromosomes, 23 pairs of very long DNA molecules and their associated proteins carry the hereditary information of a man.
What a Karyotype Tells You. A karyotype can tell how many chromosomes a person has, as well as detect any errors those chromosomes may have. Normally, a person has 46 chromosomes or 23 pairs. Based on your karyotype, cytogeneticists (people who study chromosomes) can also determine your gender.