Which of the Following Is FALSE of Down Syndrome

question 4

Multiple Choice

Which of the following is FALSE of Down syndrome?

• A) There are homologs in model organisms, such as mice and Drosophila, for genes in the Down syndrome critical region (DSCR).
• B) Studying individuals with partial trisomy of chromosome 21 identified the Down syndrome critical region (DSCR) with a small number of genes responsible for the principal symptoms.
• C) Down syndrome is the most common triploidy (3n) in which individuals have three sets of chromosomes.
• D) Molecular genetic analysis of the chromosomes in infants with trisomy 21 determined that the majority of cases were attributable to maternal nondisjunction in meiosis I.
• E) There is a link between the increased risk of Down syndrome and increased maternal age at conception.

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Definitions:

Photodiode

A semiconductor device that converts light into electrical current, commonly used in optical communication systems and light sensing.

Electrical Response

The reaction or output of an electrical system or component when a voltage or current is applied.

Forward Bias

Forward bias is the condition in which a p-n junction semiconductor, such as a diode, allows current to flow freely from the p-side (anode) to the n-side (cathode) by applying a voltage.

Current Flow

Describes the directional movement of electric charge carriers, like electrons, in a circuit, crucial for powering and operating electronic devices.