Question

examine the karyotype for a patient identified by a genetic counselor as someone with the genetic condition known as turner syndrome
which evidence would lead a genetic counselor to this conclusion?
there is an extra x chromosome
an x chromosome is missing
there is an extra chromosome 21
a chromosome 21 is missing

Explanation:

Turner Syndrome is a genetic disorder that affects females. It is characterized by the absence of one of the X chromosomes (XO). In a normal female karyotype, there are two X chromosomes. In Turner Syndrome, one X chromosome is missing.

• An extra X chromosome would be related to other disorders like Triple X Syndrome.
• An extra chromosome 21 is Down Syndrome.
• A missing chromosome 21 is not a common known syndrome related to the given options.

Answer:

An X chromosome is missing.