Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

What is the total number of nitrogenous bases in human genome estimated?

It is not included in post fertilisation event

The permissible use of the technique amniocentesis is for

According to the chromosomal theory of inheritance, the genes are located on the chromosomes ............. manner.

Plants with ovaries having only one or a few ovules, are generally pollinated by

The trisomy of 21st chromosome causes :

During the process of isolation of DNA, chilled ethanol is added to:

Assertion : Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.

Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.

Surgical removal or cutting and ligation of the ends of oviduct is known as

Name the phase of menstrual cycle when fertilization is possible.