Question

Diagrammatic representation of chromosome is

• A. Karyotype
• B. Idiogram
• C. Chromosome map
• D. Phenogram

Answer 1

The correct option is B Idiogram

Karyotype refers to a representation of relative size, shape and number of chromosomes and position of the centromere in a complete set of chromosomes. Karyotypes are species specific and are used to study their phylogenetic relationship. Diagrammatic representation of chromosomal morphology is termed as idiogram which is characteristic of a species or population; option B is correct. A karyotype is mostly, but not always, represented as idiogram; option A is incorrect. Chromosomal map refers to a graphic representation of the relative positions of genes on chromosomes. A chromosomal map is created by using chromosome bands or by recombination frequency, the degree of linkage between genes; option C is incorrect. Phenogram refers to the representation of the range of similarity among taxa, in the form of a branching diagrammatic tree, to show their phylogenetic relationship; option D is incorrect. The correct answer is B.