Question

40) Which of the following is a major contributor to variation in gene density in eukaryotes? A) repetitive sequences B) transposons C) restriction sites D) heterochromatin

Answer 1

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Solution of Q 40: D is the correct answer.

Heterochromatin is a major contributor to varation in gene density in eukaryotes. It is darkly stained, densely packed and scattered throughout the nucleus. It has two types i.e constitutive and facultative. Facultative heterochromatin contains repetitive sequence called as satellite DNA.

Transposons are genetic elements or jumping genes that contribute to cell size and are used in biotechnology to introduce foreign dna into genome. It also creates mutations in the dna.

Restriction sites are recognition sites on a dna molecules containing specific base pairs in length. Restriction enzymes bind to it.