Question

Difference between haplontic and diplontic life cycle

Answer 1

Definition of haplontic: (of an alga or other lower plant) having a life cycle in which the main form is haploid, with a diploid zygote being formed only briefly.

Definition of diplontic: (of an alga or other lower plant) having a life cycle in which the main form, except for the gametes, is diploid.

Answer 2

Difference between haplontic and diplontic life cycle

Explanation:

• Haplontic : Gametophytic phase is dominant. Sporophyte is in the form of a diploid zygote.  This way, the organism ends its diploid phase and produces several haploid cells. In the whole cycle, zygotes are the only diploid cell; mitosis occurs only in the haploid phase. The individuals or cells as a result of mitosis are haplonts, hence this life cycle is also called haplontic life cycle.

• Diplontic : Sporophytic phase is dominant. Gametophyte is single celled or few celled. In the whole cycle, gametes are usually the only haploid cells, and mitosis usually occurs only in the diploid phase. The diploid multicellular individual is a diplont, hence a gametic meiosis is also called a diplontic life cycle.

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