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Question

Endosperm cell of an angiosperm has 24 chromosomes. The number of chromosomes in the zygote and gametes would be____ and ___ respectively.


Your Answer
A
24 and 12
Your Answer
B
24 and 8
Correct Answer
C
16 and 8
Your Answer
D
16 and 12

Solution

The correct option is D 16 and 8
The ploidy of endosperm is 3n. Since the endosperm has 24 chromosomes i.e 3n = 24.
The ploidy of the gametes is n. Then the chromosomes in gametes will be 8.
The ploidy of zygote is 2n. So no. of chromosomes will be 2×8= 16
Male gamete(n)+Female gamete(n)Fertilization−−−−−−Zygote(2n)
Male gamete(n)+central cell with 2 polar nuclei(n+n)Triple fusion−−−−−−Endosperm

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