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 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 is incorrect but Statement II is true
Both Statement I and Statement II are true
Both Statement I and Statement II are false
Statement I is correct but Statement II is false
The Correct Option is A
Solution and Explanation
To determine the correctness of the given statements about codons and amino acids, let's analyze each statement separately.
-
Statement I: The codon ‘AUG’ codes for methionine and phenylalanine.
- The codon AUG is known as the start codon and it specifically codes for the amino acid methionine in eukaryotes. It does not code for phenylalanine. Instead, phenylalanine is coded by the codons UUU and UUC.
- Therefore, Statement I is incorrect.
-
Statement II: ‘AAA’ and ‘AAG’ both codons code for the amino acid lysine.
- The codons AAA and AAG indeed code for the amino acid lysine. This is accurate according to the genetic code.
- Therefore, Statement II is true.
Based on the analysis above, we conclude:
- Statement I is incorrect but Statement II is true.
Hence, the correct option is: Statement I is incorrect but Statement II is true.
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Concepts Used:
Non-Mendelian Genetics
The term - non-mendelian inheritance refers to any pattern of heredity in which features do not separate according to Mendel's laws. These principles describe how features linked with single genes on chromosomes in the nucleus are passed down through generations.
Types of Non-Mendelian Inheritance
Codominance Inheritance
It is a form of incomplete dominance in which both alleles for the same feature are expressed in the heterozygote at the same time. For example, the MN blood types of humans.
Incomplete Dominance
In a heterozygote, the dominant allele does not always completely cover the phenotypic expression of the recessive gene, resulting in an intermediate phenotype which is referred to as "incomplete dominance”.