Question

Genes that contain introns are known as
A. Discontinuous gene
B. Split gene
C. Housekeeping gene
D. Both A and B

Answer 1

Hint:An intron is a nucleotide series in a gene which is deleted when the RNA final product matures. We can say that introns are non-coding areas of the RNA transcript or of the DNA which are encoded and deleted before the translation is spliced.

Complete answer:
A gene is the fundamental functional and physical heredity unit. Genes are composed of DNA. Some genes serve as instructions for generating protein molecules. But several genes are not protein coding. Genes in humans range in size from few 100 DNA bases to over 2,000,000 bases. Each person has 2 copies of each gene, one of each parent. While the majority of genes are the same in all, a small number of genes (less than 1% of the total) vary slightly between individuals. They all have the same gene variants with minute variations in their DNA basis sequence. These minor variations contribute to the distinctive physical characteristics of each person.

An intron is a non-coding DNA sequence. Exon is a DNA coding sequence. Between exons, introns are contained in a gene. Intron-containing genes are referred to as the discontinuous gene or split genes as the exons or coding regions are separated.

Thus, the correct answer is option D. i.e., Both A and B.

Note:A split or discontinuous gene is a gene which contains DNA regions called exons, divided into introns with an unspecified region. Exons give protein coding instructions that render mRNA essential for protein synthesis.