Question

Chromosome banding was discovered by
A. Casperson et al
B. Muller
C. Berg et al
D. Christian de Duve

Answer 1

Hint: Chromosomes are the long molecules having some or all the genetic material of an organism. It is the package of DNA found in the nucleus of a cell.

Complete Answer:
Chromosome banding: Chromosome banding is discovered by the Torbjorn Caspersson. Chromosome banding is also called the G banding.
- Chromosome banding is the variation in the staining properties along the chromosome.
- Chromosome banding refers to the alternate light and dark regions along the length of a chromosome which are produced after staining with a dye.
- A band is the pattern of a chromosome that is clearly distinguishable from its adjacent segments by appearing darker or lighter with the use of one or more banding techniques.

Additional information:
- Contribution of Muller: Hermann Joseph Muller was an American geneticist. He got a Nobel prize for his work on the physiological and genetic effects of radiation. He demonstrated that exposure to X-rays can cause genetic mutations, changes to the organism's genome particularly in egg and sperm cells.
- Berg et al: Paul Berg is an American biochemist. He got a nobel prize in chemistry. Pul Berg developed a technique for splicing together DNA (deoxyribo nucleic acid).
- Contribution of Christain de Duve: Christain de Duve was the explorer of the cell who discovered many new cell organelles using centrifugation technique. He discovered lysosomes in 1955, peroxisomes in 1965.
Therefore, it has been clear from the above discussion that the chromosome banding was discovered by Casperson et al.

Hence, option A is the correct option for this question.

Note: Chromosome banding is used to distinguish between the X and Y chromosomes. Chromosome banding also permits the recognition of chromosome deletions, chromosome duplication, and other types of structural rearrangement of chromosomes.