Download App

Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance4 Marks
Question
There is only one possible sequence of amino acids when deduced from a given nucleotide. But multiple nucleotide sequences can be deduced from a single amino acid sequence. Explain this phenomenon.
✓

Answer

Some amino acids are coded by more than one codon (known as degeneracy of codon), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequences will be obtained.
For example: isoleucine has three codons AUU, AUC and AUA. Hence a dipeptide Met-Ile can have any of the following nucleotide sequences:
  1. AUG - AUU
  2. AUG - AUC
  3. AUG - AUA
If we deduce amino acid sequences of the above nucleotide sequences, all the three will code for Met-Ile.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "4 Marks Questions" from Molecular Basis of Inheritance→Molecular Basis of Inheritance — all question types→BIOLOGY STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

What are biofertilisers? Name the categories of organisms used as biofertilisers with an example for each. How do they function in organic farming?
→
Explain the different stages of oogenesis in humans starting from foetal life till its completion. When and where in the body is oogenesis completed?
→
Give an account of ecological pyramids by digrammatic representation.###Define ecological pyramids and describe the pyramid of number.###Write about three ecological pyramids with suitable examples.###Describe three ecological pyramids with suitable examples.
→
How can you, as an individual, prevent the loss of biodiversity?
→
Differentiate between incomplete dominance and co-dominance. Substantiate your answer with one example of each.
→
(i) Explain the significance of each of the following features present in plants given below:, (a) In rose-bay plant the stamens ripen before the stigma., (b) In certain species of primrose, the flowers have short stamen and long style., (c) The bisexual flower of mustard exhibits rejection of self-pollen grain., (ii) Explain how autogamy is prevented in castor and papaya plant respectively.
→
Write the differences in following-
(a) Write the causes of cancer.
(b) Explain Cancer detection
(c) Write the characters of cancer cells
(d) Write the types of cancer
→
What are micro-organisms? Describe briefly about their role in human welfare.
→
  1. State the law of independent assortment.
  2. Using Punnett Square demonstrate the law of independent assortment in a dihybrid cross involving two heterozygous parents.
→
Name and describe the steps involved in the technique widely used in forensics that serves as the basis of paternity testing in case of disputes.
→