Chromosome Number

Answer (d) Apple

Step 1: Understanding the Concept: Chromosomes are classified into four types based on the position of the centromere.
Step 2: Key Formula or Approach: Analyze the position of the centromere and the relative lengths of the resulting p (short) and q (long) arms to identify the correct chromosome type.
Step 3: Detailed Explanation: A metacentric chromosome has a middle centromere, forming two equal arms.
A submetacentric chromosome has a centromere slightly away from the middle, resulting in one shorter arm and one longer arm.
An acrocentric chromosome has a centromere situated close to its end, forming one extremely short and one very long arm.
A telocentric chromosome has a terminal centromere.
Based on the definitions, a chromosome with an extremely short and a very long arm is acrocentric.
Step 4: Final Answer: The correct option is (3).