Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

How does the transmission of each of the following diseases ?
(a) Amoebiasis (b) Malaria (c) Ascariasis (d) Pneumonia.

Both haemophilia and thalassemia are blood related disorders in humans. Write their causes and the difference between the two. Name the category of genetic disorder they both come under.

Answer the following questions:
Mature seeds of legumes are non-albuminous. Then, can it be assumed that double fertilisation does not occur in legumes? Explain your answer

Draw a biomass pyramid of the aquatic ecosystem, starting with phytoplanktou. Write the limitations of ecological pyramids.

Following are the features of genetic codes. What does each one indicate?
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.

Write down the possible levels of regulation of gene expression in eukaryotes.

Following table gives certain terms associated with ART. Fill in the space A,B,C and D.

IVF and ET	A
B	lntroduction of zygote or embryo with 8-celled blastomeres into Fallopian tube.
C	lntroduction of ova of a donor into the Fallopian tube.
D	lntroduction of semen from the husband or healthy donor into the uterus.

Recall the experiment done by Frederick Griffith. If RNA, instead of DNA was the genetic material, would the heat killed strain of Streptococcus have transformed the R-strain into virulent strain? Explain your answer.

What is meant by emasculation? When & why plant breeder employ this technique ?

Certain molecular processes are given in column (A). Provide the terms given to these processes in column (B), after selecting them from the terms:
Recombination, gene regulation, prokaryotic transcription, eukaryotic transcription, translation, replication, gene transfer, DNA fingerprinting

S.No.	Column A	Column B
(i)	DNA → DNA
(ii)	DNA → hRNA
(iii)	mRNA → Protein
(iv)	Repressor Protein + Operator → No  transcription