Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

After returning from his field, a farmer suffers from cough and cold and complains of itching Write the possible reason of it .

How will the field be affected by the increase in population of algae like Nostoc and Anabaena in water logged field? Explain the reason

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

Name the technique that is used to alter the chemistry of genetic material (DNA, RNA) to obtain desired result.

Malaria, typhoid, pneumonia and amoebiasis are some of the human infectious diseases. Which of these are transmitted through mechanical carriers?

Write the chromosomal defect in individual affected with Klinefelter's syndrome.

Following are the steps in MOET programme for herd improvement in which a cow has been administered hormones with FSH like activity. Arrange steps A to D in their correct sequence.

1. Transferred to a surrogate mother.
2. It is either mated with an elite bull or artificially inseminated.
3. Fertilised eggs at 32 cell stage are recovered non-surgically.
4. It produces 6-8 eggs instead of one egg which they normally yield per cycle.

Name an alga that reproduces asexually through zoospores. Why are these reproductive units so called?

What is funiculus?

What type of creature was cromagnon on the basis of consuming human food?