Question

Abnormal condition, when mammary gland of man develops like females
a. Goitre
b. Gynaecomastia
c. Tetany
d. None of the above

Answer 1

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Complete answer:
Mendelian disorders like haemophilia, sickle-cell anaemia and phenylketonuria are due to the mutant allele and their defective products. However, disorders can also be created by imbalance in chromosome number and chromosomal rearrangement. These are called chromosomal disorders. Down's syndrome, Klinefelter's syndrome and Turner's syndrome are common examples of chromosomal disorders.

Now let us gather some information about given options :-
> Option A, Goitre :- iodine is essential for normal rate of hormone synthesis in the thyroid. Deficiency of iodine due to less salt in the diet results in low secretion of thyroid hormone (hypothyroidism) and enlargement of thyroid gland (simple goitre).

> Option B, Gynaecomastia :- due to the presence of an extra copy of X chromosome in human male some symptoms occur . The X chromosome is significant in females . When it is present in excess in male it shows features of females . So the condition is called as gynaecomastia when breast enlargement is seen in male

> Option C, Tetany :- it is a disease of muscles . This defines the condition when spasm of muscles occurs. Spasm occurs when calcium is present in a lesser amount in body fluid.

Hence, the correct answer is option (B).

Note: Klinefelter's syndrome: It is caused and arises due to the presence of an extra copy of X-Chromosome resulting into \[44 + XXY\] type chromosome type. The defect appears due to union of an abnormal egg (22 + XX) and a normal sperm \[(22 + Y)\]or normal egg \[\left( {22 + X} \right)\] and abnormal sperm \[\left( {22 + XY} \right)\]. Such persons are sterile males with overall masculine development and some female characteristics (examples, Feminine pitched voice, development of breast or gynaecomastia).