Question

A woman with 47 chromosome due to presence of additional 21 chromosome is characterized by

• A. Superfemale
• B. Turner's syndrome
• C. Down's syndrome
• D. Triploidy

Answer 1

The correct option is C Down's syndrome

The presence of full or partial extra three copies of chromosome 21 causes Down's syndrome. It is called as trisomy 21 and is represented as 45 + XY or 45 + XX. The absence of one X-chromosome causes Turner's Syndrome which is represented as 44 + XO. Triploidy is marked by the presence of three complete sets of haploid sets of chromosomes and is represented as 3n where "n" denotes the haploid set. The presence of one or more extra X-chromosomes in females causes superfemale and is denoted by 44 + XXX. Option D is the correct answer.