In a tobacco plant, both the male and female gametes have 24 chromosomes. The zygote, formed by the fusion of these gametes, will have 48 chromosomes.
Here’s why:
Gametes:
Gametes are haploid cells, meaning they contain only one set of chromosomes (n). In tobacco, this set has 24 chromosomes.
Zygote:
The zygote is a diploid cell, formed by the fusion of two haploid gametes. Therefore, it contains two sets of chromosomes (2n). In tobacco, this means the zygote has 48 chromosomes.