Question

$32$ chromosomes are present in the green leaf of Onion. When meiosis takes place to produce gametes after fertilization how many chromosomes will be there in triploid nucleus.

• A. $32$
• B. $16$
• C. $48$
• D. $9$

Answer 1

The correct option is C $48$

In gymnosperm, leaf/root/stem are diploid (2n). So here 2n=32. But endosperm is haploid and has n=16 chromosomes. So after fertilization, the number of chromosomes in the triploid nucleus will be 3n, which means in this case it will be 3x16=48.

So, the correct option is C.