Britannica
Sources used in this answer
How is the bryophyte gametophyte different from the sporophyte?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
bryophyte
Bryophyte moss growing on oak trees.
In bryophytes, the life cycle involves an alternation of generations between two distinct, multicellular phases: the gametophyte and the sporophyte. These generations differ significantly in their physical form, genetic makeup, and independence.12
Key Differences
- Dominance and Independence: The gametophyte is the dominant, long-lived, and conspicuous generation in bryophytes. It is photosynthetically independent, meaning it produces its own nutrients. In contrast, the sporophyte is physically and physiologically dependent on the gametophyte for water, minerals, and nutrients throughout its life.321
- Genetic Composition: The gametophyte is haploid (1n), possessing a single set of chromosomes. The sporophyte is diploid (2n), having two sets of chromosomes.42
- Reproductive Function: The gametophyte produces male and female sex organs (antheridia and archegonia) that generate gametes via mitosis. The sporophyte produces spores through meiosis within a single spore-containing organ called a sporangium.413
- Structure: The gametophyte may be leafy or a flattened thallus and often features rhizoids for attachment and absorption. The sporophyte typically consists of a foot (embedded in the gametophyte), a stalk (seta), and the terminal sporangium.31