I already tried looking for the answer on line but I couldn't find it. so I was hoping some of you coud answer it.
thanks for the help
2007-04-25 15:21:08 · 5 answers · asked by Female 4 in Science & Mathematics ➔ Biology
A monosomy has one chromosome, and a trisomy has three chromosomes. Monosomy is responsible for XO instead of XX in a females sex chromosomes. Trisomy 21 is also known as down's syndrome; it is a condition where there are three chromosomes instead of two in the 21st pair.
2007-04-25 15:25:32 · answer #1 · answered by jedi_six 3 · 0⤊ 0⤋
Ordinarily, when an egg and a sperm are joined at conception, a single cell is created with a total of 46 chromosomes. With trisomy/monosomy an error occurs in chromosomal separation, which results in the formation of a second cell grouping with an extra chromosome (trisomy), or with one less chromosome (monosomy). usually chromosomes are in pairs, as I'm sure u know.
2007-04-25 22:28:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Trisomy is the presence of 3 instead of the 2 chromosomes. example is Down Syndrome on loci 21
Monosomy is the presence of only one chromosome from a pair in a cell's nucleus.
2007-04-25 22:29:10 · answer #3 · answered by African 3 · 0⤊ 0⤋
Nondisjunction causes trisomy and monosomy.
2007-04-25 22:31:44 · answer #4 · answered by ecolink 7 · 1⤊ 0⤋
I think it's by a mutation while the embryo is developing.
2007-04-25 22:26:21 · answer #5 · answered by Jake W 1 · 0⤊ 0⤋