class 12 science biology solutions – Page 4 – Tiwari Academy Discussion

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Arjun dayal

Asked: October 12, 2021In: Class 12 Biology

In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem. Give some symptoms of allergic reactions.

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Amit nagpal

Asked: October 12, 2021In: Class 12 Biology

“Migration may enhance or blurr the effects of selection”. Comment.

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Anurag

Asked: October 12, 2021In: Class 12 Biology

While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.

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Bhupender

Asked: October 12, 2021In: Class 12 Biology

What is the basic principle of vaccination? How do vaccines prevent microbial infections? Name the organism from which hepatitis B vaccine is produced.

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Nirmala

Asked: October 11, 2021In: Class 12 Biology

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?

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Picky

Asked: October 11, 2021In: Class 12 Biology

Would it be appropriate to use DNA probes such as VNTR in DNA fingerprinting of a bacteriaphage?

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Avneet Kaur

Asked: October 11, 2021In: Class 12 Biology

A single base mutation in a gene may not ‘always’ result in loss or gain of function. Do you think the statement is correct? Defend your answer.

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Anita

Asked: October 11, 2021In: Class 12 Biology

What would happen if histones were to be mutated and made rich in amino acids aspartic acid and glutamic acid in place of basic amino acids such as lysine and arginine?

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Surbhi Saha

Asked: October 11, 2021In: Class 12 Biology

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.

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Nirmala

Asked: October 11, 2021In: Class 12 Biology

Comment on the utility of variability in number of tandem repeats during DNA finger printing.

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