Down syndrome is typically categorized into three main types based on the chromosomal arrangement:

$1.$ Trisomy $21($Standard Down Syndrome$)$: This is the most common form, with an extra copy of chromosome $21$ in all cells.

$2.$ Translocation Down Syndrome: In this type, an extra copy of chromosome $21$ is attached to another chromosome, often chromosome $14.$

$3.$ Mosaic Down Syndrome: This form results from a mixture of cells with a normal chromosomal count and cells with an extra copy of chromosome $21.$

It's important to note that individuals with Down syndrome can have a wide range of abilities and symptoms, and the severity of symptoms can vary significantly among individuals.

Which form of the three Down syndrome types would you expect to have the most mild symptoms?$$

Group of answer choices

Mosaic Down Syndrome

Trisomy $21($Standard Down Syndrome$)$

Translocation Down Syndrome

All have the same symptoms