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.
Most mammals have only one pair of sex chromosomes in each cell. Males have one Y chromosome and one X chromosome, while females have two X chromosomes. In mammals, the Y chromosome contains a gene, SRY, which triggers embryonic development as a male. The Y chromosomes of humans and other mammals also contain other genes needed for normal sperm production.
Report Abuse. There is only one pair of sex chromosomes. XX for female and XY for a male. I believe the other 22 chromosome pairs in a human are all for other purposes (though can carry sex linked genes). I hope this answers your question-I wasn't sure if this was exactly what you were asking.o the male child should have XY chromosomes and as cells split by mitosis, the daughter cells should have XY chromosomes only.So all the cells should have XY chromosomes in male. But in a picture showing 23 pair chromosomes in my science book, I found that only 23rd chromosomal pair of chromosomes had XY depiction.