Question

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

• A. 42
• B. 84
• C. 63
• D. 21

Answer 1

The correct option is C

63

The correct option is C.

The explanation for correct option:

1. The aleurone layer is said to be the outermost layer of the endosperm, followed by the inner starchy endosperm.
2. The ploidy of endosperm in angiosperm is triploid i.e. 3n(central cell gets fused with one male gamete i.e 2n+n) due to the event of double fertilization.
3. The root tip cell is diploid (2n) = 42.
4. So n will be 21.
5. Thus the endosperm will be 3n=21×3=63.

Final answer: The number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells is 63.