You are born with it>>>>>>>>>>>During meiosis, chromosomes are separated equally. When they are notseparated equally - this is known as non-disjunction - the gametes end up with either an extra chromatid or no chromatid. In Down syndrome the offspring carries an extra chromatid in Chromosome 21, aka Trisomy 21
Its called disconjunction. Sometimes it is so bad that they have a miscarriage or the following happens:Trisomy (extra chromosomeso have 47 chromosomes instead of 46)Down's syndrome (andextra number 21 chromosome)Klinefelter's syndrome (males with an extra X chromosome...XXY)
Nondisjunction
no
yes . it is . nondisjunction is takes place during meiosis.
Nondisjunction is the addition or deletion of an entire chromosome. The result could be autism or downs syndrome
Nondisjunction is the failure of a homolog to separate during meiosis causing trisomy (an extra chromosome) or monosomy (a missing chromosome), it can be harmful because it is a mutation that can cause many devastating disease, for example nondisjunction of the 21st chromosome causes down syndrome, another example of nondisjunction being harmful, is nondisjunction of the sex chromosomes, causing Turner's or Klinefelter's syndrome two very devastating diseases.
One can find more information about nondisjunction on Wikipedia or Biology Online. Both of these website have lots of information. One can see diagrams relating to nondisjunction on Google Images.
Nondisjunction is a very bad thing and cells and can lead to lying of the cell.
The significance of crossing over and nondisjunction is that it increases biodiversity. This is important for the environment and food chains.
Nondisjunction.
Nondisjunction
maybe it depends