Question

Characteristic features of mitotic metaphase are
A. Each chromosome is unpaired,
B. \(2n\) chromosomes are seen,
C. Each bivalent has four chromatids,
D. Centromeres of all the chromosomes lie on the equatorial plate,
E. Homologous chromosomes form bivalents.

• A. B and E Only
• B. A, B and D Only
• C. A, B and E Only
• D. A, D and E Only

Hint:

In mitotic metaphase, chromosomes are arranged at the equatorial plate, but bivalents are not formed.

Answer 1

The Correct Option is B

Concept:
Metaphase is the stage of cell division in which chromosomes arrange themselves at the equatorial plate.

Step 1: Check statement A.
In mitosis, chromosomes do not pair with homologous chromosomes. Therefore, each chromosome remains unpaired. \[ A \text{ is correct} \]

Step 2: Check statement B.
In mitosis, chromosome number remains the same as the parent cell. \[ 2n \text{ chromosomes are seen} \] So, B is correct.

Step 3: Check statement C.
Bivalents are formed in meiosis, not in mitosis. Therefore, this statement is incorrect. \[ C \text{ is incorrect} \]

Step 4: Check statement D.
During metaphase, centromeres of chromosomes lie on the equatorial plate. \[ D \text{ is correct} \]

Step 5: Check statement E.
Homologous chromosomes form bivalents during meiosis-I, not during mitosis. \[ E \text{ is incorrect} \] Thus, correct statements are: \[ A,B,D \] \[ \therefore \text{Correct Answer is (B)} \]