Question

Find the incorrect statement among the following:\n(A) In sex-linked recessive traits, the gene is transmitted from an unaffected carrier female to some of the male progeny.\n(B) Accumulation of phenylpyruvic acid in the brain results in mental retardation.\n(C) Individuals affected by Down’s Syndrome will have congenital heart defects and are more intelligent.\n(D) Turner’s Syndrome is caused due to the absence of one X chromosome.

• A. In sex-linked recessive traits, the gene is transmitted from an unaffected carrier female to some of the male progeny.
• B. Accumulation of phenylpyruvic acid in the brain results in mental retardation.
• C. Individuals affected by Down’s Syndrome will have congenital heart defects and are more intelligent.
• D. Turner’s Syndrome is caused due to the absence of one X chromosome.

Hint:

Accurate knowledge of genetic disorders aids in diagnosis and management.

Answer 1

The Correct Option is C

Down’s Syndrome is caused by trisomy of chromosome 21, leading to developmental and intellectual disabilities, as well as congenital heart defects.
The statement about increased intelligence is incorrect.
Turner’s Syndrome, on the other hand, results from a missing X chromosome (45, X).