Which of the following characteristics are associated with a female suffering from Turner’s syndrome?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → All of the above
Turner's syndrome is a chromosomal disorder of females caused by the absence of one X chromosome. The karyotype is 45, X0 (written XO in the option). The missing X affects sexual development, so the ovaries do not develop fully and the person is sterile.
Option (1) 45 chromosomes with an XO pattern — Correct statement, but it is only one of the correct points, so on its own it is not the answer. The female has 45 chromosomes instead of 46, with a single X (X0).
Option (2) Underdeveloped ovaries — Correct statement, but it is only one of the correct points, so on its own it is not the answer. Her ovaries are rudimentary, which means poorly developed, so she is sterile.
Option (3) Absence of secondary sexual characteristics — Correct statement, but it is only one of the correct points, so on its own it is not the answer. Such females lack other secondary sexual characters, which the option calls absence of secondary sexual characteristics.
NCERT Extract:
Chromosomal Disorders – “… Turner’s Syndrome : Such a disorder is caused due to the absence of one of the X chromosomes, i.e., 45 with X0, Such females are sterile as ovaries are rudimentary besides other features including lack of other secondary sexual characters (Figure 4.17 b).”