Question

Select the statements that describe the characteristics of genes

(i) Genes are a specific sequence of bases in a DNA molecule (ii) a gene does not code for proteins

(iii) in individuals of a given species, a specific gene is located on a particular chromosome (iv) each chromosome has only one gene

• A. (i) and (ii)
• B. (i) and (iii)
• C. (i) and (iv)
• D. (ii) and (iv)

Answer 1

The correct option is B

(i) and (iii)

The correct option is option B.

The explanation of the correct option:

1. Genes are referred to as a segment of DNA.
2. DNA molecules consist of a lot of genetic information.
3. This information is present in the sequence of nitrogen bases.
4. As a gene is a segment of DNA, it is also a specific sequence of bases in a DNA molecule.
5. Hence, Statement (i) is true.
6. Every organism has Genetic variation and diversity.
7. And this genetic variation is because any given gene has a particular location on DNA for a given species.
8. It makes everyone's DNA unique for themselves.
9. Hence, statement (iii) is also true.

The explanation for the incorrect options:

Option A:

1. As explained above, statement (i) is true.
2. But in protein synthesis, nitrogen bases present on DNA play an important role.
3. As they serve information for the synthesis of amino acids and so as proteins.
4. Hence, statement (ii) is false about genes.

Option C:

1. As explained above, statement (i) is true.
2. But chromosomes are made by supercoiling DNA.
3. Thus, they contain large molecules of DNA.
4. As genes are small segments of DNA, a chromosome has several genes located on it.
5. Hence, statement (iv) is also false.

Option D:

1. As explained above, statements (ii) and (iv) are incorrect.
2. Hence option D is incorrect.

Final answer:

Statements (i) Genes are a specific sequence of bases in a DNA molecule and (iii) In individuals of a given species, a specific gene is located on a particular chromosome and describe the characteristics of genes.