Question

Which of the following statements are correct about the genes?
(A) Genes are located on chromosomes
(B) Split genes are composed of exons only
(C) Genes move from one linkage group to another
(D) Chromosomes with identical arms on which genes are located are known as isochromosomes
Choose the correct answer from the options given below:

• A. (A), (B), and (D) only
• B. (A), (C), and (D) only
• C. (A) and (D) only
• D. (A), (B), and (C) only

Answer 1

The Correct Option is A

The correct answer is (1) (A), (B) and (D) only.

Let's break down each statement:

(A) Genes are located on chromosomes: This statement is correct. Genes are segments of DNA, and they are located on chromosomes. Chromosomes carry genetic information that is passed on during reproduction.

(B) Split genes are composed of exons only: This statement is incorrect. Split genes (present in eukaryotes) consist of both exons (coding regions) and introns (non-coding regions). The exons are the parts that are expressed, while the introns are spliced out during mRNA processing.

(C) Genes move from one linkage group to another: This statement is incorrect. Genes do not typically move from one linkage group to another under normal circumstances. A linkage group refers to a group of genes located on the same chromosome, which are usually inherited together.

(D) Chromosomes with identical arms on which genes are located are known as isochromosomes: This statement is correct. Isochromosomes are chromosomes that have identical arms (both the short and long arms are identical due to an abnormality in chromosome structure).

Thus, the correct answer is (1) (A), (B) and (D) only.