Evolution — BIOLOGY STD 12 Science — Question

You have a friend whose parents are too indulgent in his/her daily affairs. They think him/her to be still young which makes him/her sad and is upset all the time. As he/she feels that the parents should give him/her opportunity to take independent decision on some issues.

1. Would you support your friend and why?
2. Write the characteristics of this age group.
3. List two curative measures.

Explain evolution with the help of its embryological evidences.###Explain evidence from embryology in evolution.

Discuss the different barrier of innate immunity.

The following is the illustration of the sequence of ovarian events (a – i) in a human female.

What is the difference between “d” and “e” ?

Observe the representation of genes involved in the lac operon given below:

1. Identify the region where the repressor protein will attach normally.
2. Under certain conditions repressor is unable to attach at this site. Explain.
3. If repressor fails to attach to the said site what products will be formed by z, y and a?
4. Analyse why this kind of regulation is called negative regulation.

Mention three applications and future challenges of human genome project.

What is placenta? Draw well labelled diagram of human embryo showing placenta in uterus and also write its four functions.

What essential features must be present in a cloning vector?

Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following the base-pair rules.

Find out from newspapers and popular science articles any new fossil discoveries or controveries about evolution.