Question

The chromosomal complement of individuals with Turner’s syndrome is-
a. 44A + XX
b. 44A + XY
c. 44A + XO
d. 44A + XXY

Answer 1

A female chromosomal condition that results from a sex chromosome that is absent or incomplete. A variety of medical and developmental problems can be caused, including short height, ovarian failure to develop, and heart defects.

Complete answer:

Option A is incorrect. 44 of these 46 chromosomes are autosomes and 2 are sex chromosomes, respectively. The Y chromosome is considered a sex chromosome that carries the genes for male characters and the X chromosome is considered one that carries the genes for female characters. So, in females, the chromosomes are 44 + XX.

Option B is incorrect. Standard chromosomes are registered as: 44 autosomes plus a woman's two X chromosomes (karyotype 46, XX), 44 autosomes plus a man's one X chromosome and one Y chromosome (karyotype 46, XY).

Option C is correct. In each cell, individuals usually have two sex chromosomes: women have two X chromosomes, while men have one X chromosome and one Y chromosome. When one natural X chromosome is found in the cells of a female and the other sex chromosome is absent or structurally altered (44A + XO), Turner syndrome occurs. Small height, postponed puberty, infertility, heart disorders and some learning disabilities are signs.

Option D is incorrect. Klinefelter 's Syndrome is an aneuploid disorder characterised in a male by the presence of one or more additional chromosomes (44+XXY/ 44+XXXY/ 44+XXXXY). Depending on the number of X-chromosomes, a human male with Klinefelter 's syndrome, 44+XXY/ 44+XXXY/ 44+XXXXY, can have 1, 2 or 3 Barr bodies. Some feminine characters in otherwise male individuals are created by the presence of an additional X-chromosome copy. They are sterile males with swollen breasts (Gynecomastia) that are feminised.

Hence, the correct answer is option (C).

Note: Before birth (prenatally), during infancy or in early childhood, Turner syndrome may be diagnosed. In females with mild signs and symptoms of Turner syndrome, the diagnosis is sometimes postponed until the age of puberty or young adulthood.