If you didn't know already, trisomy 21 is also known as Down Syndrome. It is caused by error in the cell division which is called nondisjunction. It leaves a sperm or egg cell with an extra copy of chromosome 21 before or after conception.
Answer:
18 chromosomes
Explanation:
if their somatic cell have 36 chromosomes then gamete have 18 chromosomes. because meiosis is a reduction division and produce gametes with half number of chromosomes. so their gametes recieve 18 chromosomes.
A SUBSTANCE IS A PARTICULAR FORM OF MATTER WITH UNIFORM PROPERTIES IT CANNOT BE SEPARATED INTO SEPERATE PHYSICAL SEPERATION METHODS
It is called data, it is the detailing of the results in a column or chart so that it can be compared with other “data“.
