What is the difference between trisomic …
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Posted by Manoj Mahi 5 years ago
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Yogita Ingle 5 years ago
In trisomy, there is an extra copy of ONE chromosome in an egg or sperm cell. As a result, after fertilisation the foetus has 47 chromosomes instead of the usual 46. An example of this is Downs Syndrome, in which there is an extra chromosome 21.
In triploidy, the foetus has an entire extra set of chromosomes -- so it has 69 chromosomes instead of the usual 46. A triploid foetus almost always results in miscarriage or stillbirth. There is too much genetic material for the baby to survive. If it is born, it dies in infancy.
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