Down syndrome is characterized by:
single base mutations
the presence of 47 chromosomes per somatic cell
increasing risk with younger maternal age
the presence of an extra chromosome 18 in each somatic cell
the same symptoms observed in each individual
The correct option is:
The presence of 47 chromosomes per somatic cell.
Others optiona are incorrect because:
Single base mutations : It is not a single base mutation. example of single base mutation is Sickle Cell Anemia.
Increasing risk with younger maternal age : in increasing risk with older maternal age.
The presence of an extra chromosome 18 in each somatic cell : the presence of an extra chromosome 21 in each somatic cell.
The presence of an extra chromosome 18 in each somatic cell is called Edward's Syndrome.
The same symptoms observed in each individual: Severity of symptoms varies among individuals.
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