Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Name the technology used for crop improvement

Write the embryonic stage which gets implanted into uterine wall of human female.

Why is 'plasmid' an important tool in biotechnology experiments?

Lac operon shows the control of gene expression at the _________ level, in E.coli.

Which among the following is true for BT toxin?

1. It kills the lepidopterans.
2. It is coded by 'cry' gene.
3. It exists in bacteria as prototoxin.
4. All are true.

Mendel observed two kinds of ratios, 3 : 1 and 1 : 2 : 1, in the F, generation in his experiments on garden pea. Name these two ratios respectively.

Mention the type of allele which expresses itself only in homozygous condition in an organism.

Name the negatively charged and positively charged components of a nucleosome.

OR

Name the positively charged protein around which the negatively charged DNA wrapped.

Indiscriminate diagnostic practices using X-rays etc. Should be avoided. Give one reason.

Do DNA fragments move towards the anode during gel electrophoresis? If yes, explain.