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:
Gene Location on Chromosomes
Statement (A) is correct. Genes, the basic units of heredity, are located at specific positions called loci on structures known as chromosomes.
Split Gene Composition
Statement (B) is incorrect. Split genes, found in eukaryotes, are interrupted sequences comprising coding regions called exons and non-coding regions called introns. Both are initially transcribed, but introns are removed later.
Gene Movement Between Linkage Groups
Statement (C) is correct. While genes reside on specific chromosomes (linkage groups), genetic events like translocations can move segments of chromosomes, thereby relocating genes to different linkage groups. Evolutionary processes also lead to changes in gene distribution across chromosomes.
Isochromosome Definition
Statement (D) is correct. Isochromosomes are abnormal chromosomes where one arm (either the p-short arm or the q-long arm) is duplicated, and the other arm is missing. Consequently, both arms are identical.
Summary of Correct Statements
Based on the analysis:
- (A) Genes are located on chromosomes. (Correct)
- (B) Split genes are composed of exons only. (Incorrect)
- (C) Genes move from one linkage group to another. (Correct, via mechanisms like translocation)
- (D) Chromosomes with identical arms are isochromosomes. (Correct)
Therefore, the correct statements are (A), (C), and (D).
Important Questions from Molecular Biology
Which of the following removes the RNA primers from the lagging strand?
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The movement of a segment of DNA from one site of the genome to another is called
