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Down syndrome is characterized by: single base mutations the presence of 47 chromosomes per somatic cell...

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

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Answer #1

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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