In Fragile-X Syndrome

question 81

Multiple Choice

In fragile-X syndrome,

• A) females are affected more severely than males.
• B) a short sequence of DNA is repeated many times to create the fragile site.
• C) both the X and Y chromosomes tend to break when prepared for microscopy.
• D) all people who carry the gene that causes the syndrome are mentally retarded.
• E) the basic pattern of inheritance is autosomal dominant.

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Definitions:

Phantasmidine

A chemical compound naturally occurring in some amphibian species, known for its bioactive properties.

Chiral Center

A carbon atom that is attached to four different groups, making its mirror images non-superimposable.

Stereoisomer

Molecules that have the same molecular formula and sequence of bonded atoms but differ in the three-dimensional orientations of their atoms in space.

Configuration

The fixed arrangement of atoms in a molecule that cannot be changed without breaking chemical bonds, different from conformation.