Question

What would be the number of chromosome of the aleurone cells of a plant with 42 chromosomes in its root tip cells 1?

• A. $42$
• B. $63$
• C. $84$
• D. $21$

Answer 1

Answer: (B)

$63$

The ploidy of root tip cells is diploid(2n) and the ploidy of the aleurone cells is triploid(3n).

The number of chromosomes in the root tip cell is 42 and the number of chromosomes in aleurone cells(3n) of the plant is

$2n=42,n=21$

$3n=3\times 21=63.$

So, the correct answer is '63'.