Question

Chromosomes are structures that hold DNA and are usually represented by all _______’s in girls, while boys also include a ________ chromosome, in shape.

(A) 2N; X
(B) Y; X
(C) X; 2N
(D) Y; 2N

Answer 1

The correct representation of chromosomes in girls is XX, while in boys it is XY, making option B (Y; X chromosome) the correct answer.

Step-by-step explanation:

Chromosomes are structures within the nucleus that hold DNA and are represented by two X chromosomes (XX) in girls, while boys have one X chromosome and one Y chromosome (XY). Therefore, the correct answer to the question is (B) Y; X chromosome. In girls, all the sex chromosomes are X's, while in boys there is a combination of X and Y chromosomes, which determine the male sex. Notably, human cells typically contain 46 chromosomes, constituting 23 pairs, with one set inherited from each parent. During cell division, chromosomes become visible and can be identified by their characteristic banding patterns when stained and observed under a microscope.