Question

If the number of chromosomes in the cells of the calyx is 16, how many chromosomes will be formed in the endosperm after double fertilisation?

Hint:

Endosperm is $3n$ in Angiosperms but $n$ (haploid) in Gymnosperms. Always check the plant group!

Answer 1

Step 1: Understanding the Concept:
Calyx cells are somatic/vegetative cells and are diploid (\(2n\)).
In angiosperms, the endosperm is formed by the fusion of one male gamete (\(n\)) and two polar nuclei (\(n+n\)), resulting in a triploid (\(3n\)) tissue.

Step 2: Key Formula or Approach:
Given: Somatic number (\(2n\)) = 16.
Therefore, haploid number (\(n\)) = \(16/2 = 8\).

Step 3: Detailed Explanation:
The endosperm is triploid (\(3n\)).
Calculating \(3n\):
\[ 3 \times 8 = 24 \]

Step 4: Final Answer:
The endosperm will have 24 chromosomes.