Biology - General Awareness Questions and Answers

Answer: Option [C]

The correct answer is evolved from common stock.

Answer: Option [D]

Chromosomes of all races of human are similar in banding only.

Answer: Option [D]

All the above option are correct.

Chromosomes show different banding patterns depending on the type of the dye and the treatment variations. Chromosomes stained with quinacrine mustard gives alternating bands of bright and dull fluorescence, which are called as Q bands. When the pre-treatment of chromosomes with the proteolytic enzyme trypsin is followed by staining with Giemsa stain, process is called as G banding. It stains euchromatin, centromeric and heterochromatin regions. When chromosomes are stained with Giemsa stain in alkaline medium, process is called as C banding. It stains constitutive heterochromatin regions.

Answer: Option [A]

Chromosome were first seen by Hofmeister. Wilhelm Friedrich Benedikt Hofmeister was a German biologist and botanist who observed structures (which later came to be known as chromosomes) in a dividing cell nucleus in 1848.

Answer: Option [B]

As per latest information human genome has 20000 genes. There are an estimated 19,000-20,000 human protein-coding genes. The estimate of the number of human genes has been repeatedly revised down from initial predictions of 100,000 or more as genome sequence quality and gene finding methods have improved and could continue to drop further.