pantom15howard
pantom15howard pantom15howard
  • 25-06-2017
  • Biology
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Which type of chromosomal mutation causes this form of Down syndrome?

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redhead7
redhead7 redhead7
  • 25-06-2017
Trisomy 21 (nondisjunction) Down syndrome is usually caused by an error in cell division called "nondisjunction." Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.
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Mr420
Mr420 Mr420
  • 29-06-2017
Nondisjunction is the chromosomal mutation 
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