Genetic code determines-

Options

A. Structural pattern of an organism
B. Sequence of amino acid in protein chain
C. Variation in offsprings
D. constancy of morphological trait

Answer

**Step-by-Step Solution:**

1. **Understanding Genetic Code**: The genetic code is a set of rules that defines how the information encoded in genetic material (DNA or mRNA) is translated into proteins. It consists of sequences of nucleotides grouped into codons.

2. **Codons**: There are 64 possible codons formed by combinations of the four nucleotide bases (adenine, cytosine, guanine, and uracil in RNA). Each codon consists of three nucleotides.

3. **Amino Acids**: The 64 codons correspond to 20 different amino acids. This means that some amino acids are encoded by more than one codon (redundancy).

4. **Role of mRNA**: The codons are found on messenger RNA (mRNA), which is transcribed from DNA. During protein synthesis, these codons are read by transfer RNA (tRNA) that carries the corresponding amino acids.

5. **Determining Protein Sequence**: The sequence of codons on the mRNA determines the sequence of amino acids in a protein chain. This is crucial because the specific order of amino acids will ultimately determine the structure and function of the protein.

6. **Evaluating Options**:
- **Structural pattern of an organism**: Incorrect. The genetic code does not directly determine the structural pattern.
- **Sequence of amino acids in protein chain**: Correct. The genetic code directly determines the sequence of amino acids.
- **Variation in offspring**: Incorrect. While genetic variation is influenced by DNA, it is not determined by the genetic code itself.
- **Constancy of the morphological trait**: Incorrect. This is not determined by the genetic code.

7. **Conclusion**: The correct answer is that the genetic code determines the **sequence of amino acids in a protein chain**.

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