In most animals, the diploid state of the life cycle is much larger than the haploid state.
In meiosis, a diploid cell gives rise to haploid cells and in fertilization, two haploid cells fuse to form a diploid zygote.
The haploid-diploid life cycle is a complex life cycle and has lots of variation. It is the common life cycle among plants as all land plants, the vascular plants and the bryophytes are haploid-diploid.
The diploid phase is that phase of the plant life cycle where the zygote develops after fertilization. The haploid life cycle is the simplest life cycle which is found in many single-celled eukaryotic organisms. Organisms with a haploid life cycle spend the majority of their lives as haploid gametes and When they fuse, they form a diploid zygote.
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