Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Mention the differences between DNA replication and transcription.

(i) Write the complete name of IUDs.
(ii) IUDs secreting the hormone are said to be best contraceptive to keep space between children. Why?

Difference between Down's syndrome and Turner's syndrome.

What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.

Name a disorder, give the karyotype and write the symptoms a human suffers from as a result of monosomy of the sex chromosome.

Describe the role of microbes in the production of bioactive molecules.###State the sources and uses of statins and cyclosporin.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters.

1. Work out the cross with the help of a Punnet square.
2. Name the type of the cross carried out.

If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father? Comment.

Draw a yeast cell reproducing by budding and show the following labels in it:

1. Bud.
2. Parent cell.
3. Nucleus of bud.
4. Nucleus of parent cell.

Mention the role of ribosomes in peptide-bond formation. How does ATP facilitate it?