Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Substantiate with the help of one example that in an ecosystem mutualists:

1. Tend to co-evolve.
2. Are also one of the major causes of biodiversity loss.

Mention the product and its use produced by each of the microbes listed below
(i) Steptococcus
(ii) Lactobacillus
(iii) Saccharomyces cerevisiae

Complete the following table using alphabets (a to k)

DNA triplet 3’ → 5’	mRNA codon 5’ → 3’	Anticodon	Amino acid
a	b	UAC	c
d	UGG	e	Tryptophan
AAG	f	g	h
i	j	GAC	k

Lactic Acid Bacteria (LAB) sets milk into curd and also plays a very beneficial role for human health. Give any two suitable reasons.

Following is the DNA sequence representing a part of the gene:
TAC CCC CAC GAG TTA TAT ATA CGG GGG CAT CAT ATG From it derive

1. The RNA transcript
2. The spliced mRNA (assuming that all codons containing a C represent the intron)
3. The number of amino acids it can code for

A man with blood group A married a woman with blood group B. They have a son with AB blood group and a daughter with blood group O. Work out the cross and show the possibility of such inheritance.

Draw schematically a single polynucleotide strand (with at least three nucleotides). Provides labels and directions.

List the post-fertilisation events in angiosperms.

a. Give an example of viral biocontrol agent.
b. Why are they considered to be desirable when an ecologically sensitive area is being treated?

Name the source of statin and state its action on the human body.

OR

Name a microbe used for statin production. How do statin lower blood cholesterol level?