A chromosome map at 500X magnification of a patient with Down’s syndrome. An arrow indicates the 21st pair of chromosomes, which show the instance of trisomy 21, a third chromosome in that pair which causes Down syndrome.
A chromosome map at 500X magnification of a patient with Down’s syndrome. An arrow indicates the 21st pair of chromosomes, which show the instance of trisomy 21, a third chromosome in that pair which causes Down syndrome.
