Question

The diagrammatic represention of chromosomes is known as
A. Idiogram
B. Karyotype
C. Holotype
D. Homotype

Answer 1

Hint: The diagrammatic (schematic) representation of chromosomes show the banding pattern and relative size of the chromosomes. This banding pattern can be seen under a microscope when a tightly coiled chromosome is stained with a particular chemical.

Complete answer: Idiogram is very useful in identifying mutations in the chromosomes.
Ideogram shows all pairs of homologous chromosomes (chromosomes with same length and centromere position) in the nucleus. All the chromosomes are aligned in order of size so that centromeres are in the same line.

So, the correct answer is “Option A”.

Additional Information: Karyotype means a pictorial representation of a person's chromosomes. To get this picture, the chromosomes are isolated, stained, and then observed under a microscope for examination.
The holotype is actually an original single plant or animal that is used to describe a new species for the first time.
Homotype means having the same basic type of structure as something else. For example, the left arm is the homotype of the left leg and the right arm is the homotype of the right leg.

Note: To study chromosomes we use karyotype while the pictorial representation of original chromosomes is idiogram. The purpose of karyotype and ideogram is very different. In karyotype, the chromosomes are set in order to study them while idiogram helps to identify any changes in structure or number of chromosomes. The chromosomes can be compared band by the band by using a standard format, idiogram.