Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Explain Structure of ecosystem.

What are Role of the three parts of the transcription unit?

Intensely lactating mothers do not generally conceive. Is it true? If yes, explain the reason.

Name the blank space a, b, c and d in the table given below:

S.No.	Type of Microbe	Name	Commercial Product
1.	Fungus	a	Penicillin.
2.	Bacterium	Acetobacter aceti.	b
3.	c	Aspergillus niger.	Citric acid.
4.	Yeast	d	Ethanol.

How do plants produce seeds through apomixis? Explain with the help of an example.

In a sea shore, the benthic animals live in sandy, muddy and rocky substrata and accordingly developed the following adaptations. Find the suitable substratum against each adaptation.

1. Burrowing ______________________.
2. Building cubes ________________________.
3. Holdfasts/ peduncle _________________________.

Explain: Multiple allelism

Do you think that the alternate splicing of exons may enable a structural gene to code for several isoproteins from one and the same gene? If yes, how? If not, why so?

Given below is one of the strands of a DNA segment
3' TACGTACGTAACGTACG 5'
(a) Write its complementary strand.
(b) Write a possible RNA strand that can be transcribed from the above DNA molecule formed.

Discuss with your teacher what does 'a suitable gene' means, in the context of DNA vaccines.