English

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. - Biology

Advertisements
Advertisements

Question

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.

Short Note

Solution

The statement is correct. Because of degeneracy of codons, mutations at third base of codon, usually does not result into any change in phenotype. This is called silent mutations.

shaalaa.com
Genetic Code
  Is there an error in this question or solution?
Chapter 6: Molecular Basis of Inheritance - SHORT ANSWER [Page 42]

APPEARS IN

NCERT Exemplar Biology [English] Class 12
Chapter 6 Molecular Basis of Inheritance
SHORT ANSWER | Q 13. | Page 42

RELATED QUESTIONS

Give an example of a codon having dual function.


Write the contributions of the following scientists in deciphering the genetic code.
George Gamow; Hargobind Khorana; Marshall Nirenberg; Severo Ochoa


Differentiate between the genetic codes given below:
Degenerate and Initiator


The first codon to be deciphered was __________ which codes for ________.


Give reasons: Genetic code is ‘universal’.


Name the anticodon required to recognize the following codon: AAU.


Name the anticodon required to recognize the following codon: CGA


Name the anticodon required to recognize the following codon: UAU


One of the following is true with respect to AUG.


Genetic code is ______.


Khorana first deciphered the triplet codons of ______.


The change of the light coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonarid) is due to ______.


Amino acids which are specified by single codons are ______.


The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as ______.


Sickle cell anemia results from a single base substitution in a gene, thus it is an example of ______.


AUG on the mRNA will result in the activation of which of the following RNA having the correct combination of amino acids: 

  Site A Site B
A. UAC Methionine
B. Methionine UAC
C. Methionine AUG
D. AUG Methionine

Which of the following organ is essential for photorespiration?


Phenylalanine is a ______.


Percentage of mitochondrial DNA in the cell is:


Genetic code was discovered by:


Which amino acid is determined by four genetic codes?


How many codons code for amino acid?


Statement I: The codon ‘AUG’ codes for methionine and phenylalanine.

Statement II: ‘AAA’ and ‘AAG’ both codons code for the amino acid lysine.

In the light of the above statements, choose the correct answer from the options given below.


Statement I:

The codon ‘AUG’ codes for methionine and phenylalanine.

Statement II:

‘AAA’ and ‘AAG’ are both codons that code for the amino acid lysine.

In light of the above statements, choose the correct answer from the options given below.


Based on your understanding of genetic code, explain the formation of any abnormal hemoglobin molecule. What are the known consequences of such a change?


There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×