Human Health and Disease — BIOLOGY STD 12 Science — Question

Large, colourful, fragrant flowers with nectar are seen in

Which of the following groups of plants are highly useful in increasing soil fertility

There is a restriction endonuclease called EcoRI. What does 'co' part of it stands for:

Which of the following is not functionally analogous with others in the group

Eco R1 cuts the DNA between bases G and A only when the sequence of GAATTC is present. The number of nucleotides present in the resultant sticky ends that will be formed in each of the two strands of DNA after this enzyme cuts the DNA will be:

	Vector DNA	Foreign DNA
A	1 & 5	5 &1
B	2 & 4	4 &2
C	2 & 5	5 & 2
D	3 & 4	4 & 3

An example of gene therapy is

Physical, psychomotor and mental development is retarted in an individual affected with

Which of the following is formed by producers in ecosystem?

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is.

Select incorrect statement (w.r.t. artificial hybridisation)