If a cabbage leaf cell has 18 chromosomes (diploid set of chromosomes), then how many chromosomes are there in the sperm

If a cabbage leaf cell has 18 chromosomes (diploid set of chromosomes), then how many chromosomes are there in the sperm (haploid set), how many are in the zygote (diploid set), and in the endosperm (triploid set of chromosomes)?

A diploid set of 18 chromosomes, both in leaf cells and in the zygote (fertilized egg); haploid: 18: 2 = 9; triploid 9* 3 = 271.
Answer: sperm – 9, zygote – 18, endosperm – 27.

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