Question

Considering that males can have Klinefelter (XXY) syndrome, XYY, and normal XY chromosomal combinations, and females can have Turner (XO) syndrome, poly-X (XXX, XXXX), and normal XX combinations, it is obvious that:_________.
(A) maleness results from the presence of only one X chromosome
(B) maleness results from the absence of two or more X chromosomes
(C) maleness results from the minimal presence of one Y chromosome
(D) femaleness results from the presence of two or more X chromosomes

Answer 1

Answer:

C) maleness results from the minimal presence of one Y chromosome

Explanation:

• From the given question, it can be clearly observed that in males irrespective of whichever syndrome they have a Y chromosome is always present whereas in females Y chromosome is not present.

• Hence, one cal conclude that whenever the Y chromosome is present the individual acquires male characters.

• The Y chromosome whenever present produces the hormones that leads to maleness, and the number of Y chromosomes in males can also be more than  one such as in case of XYY Klinefelter syndrome.