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adayisenga
01.07.2019 •
Biology
Occasionally a child is born with an extra chromosome 13, but never do you see a child with an extra chromosome 12, why?
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Ответ:
This is because some of the trisomies (one extra chromosome, three instead of two) are fatal, births cannot survive.
Theoretically, trisomies can occur with any chromosome, but often result in miscarriage.
The types of autosomal trisomy that survive to birth in humans are:
Trisomy 8 or Warkany syndrome 2
Trisomy 9
Trisomy 13 or Patau syndrome
Trisomy 18 or Edwards syndrom
Trisomy 21 or Down syndrome.
Ответ:
2.Strengthen body tissues