Do Charophytes have alternation of generations?
Charophytes form sporopollenin and precursors of lignin, phragmoplasts, and have flagellated sperm. They do not exhibit alternation of generations.
What is alternation of generation in fungi?
Alternation of generations is a reproductive cycle of certain vascular plants, fungi, and protists. Two gametes (originating from different organisms of the same species or from the same organism) combine to produce a zygote, which develops into a diploid plant of the sporophyte generation.
What is alternation of generation in Ferns?
Alternation of Generations The fern life cycle requires two generations of plants to complete itself. This is called alternation of generations. One generation is diploid, meaning it carries two identical sets of chromosomes in each cell or the full genetic complement (like a human cell).
Do Charophytes have swimming sperm?
The sister group of the Charophytes are the Chlorophyta. In some charophyte groups, such as the Zygnematophyceae or conjugating green algae, flagella are absent and sexual reproduction does not involve free-swimming flagellate sperm.
Is the Sporophyte stage dominant in Charophytes?
All extant green algae (chlorophytes and charophytes) have a dominant haploid (gametophyte) phase, and the only diploid (sporophyte) phase of their life cycle is the unicellular zygote (Haig, 2010) .
Which generation is dominant in algae?
gametophyte generations
Most algae have dominant gametophyte generations, but in some species the gametophytes and sporophytes are morphologically similar (isomorphic). An independent sporophyte is the dominant form in all clubmosses, horsetails, ferns, gymnosperms, and angiosperms that have survived to the present day.
What is the process of alternation of generations?
Alternation of generations describes a plant’s life cycle as it alternates between a sexual phase, or generation and an asexual phase. The sexual generation in plants produces gametes, or sex cells and is called the gametophyte generation. The asexual phase produces spores and is called the sporophyte generation.
What are the two generations in the fern life cycle?
The life cycle of the fern has two different stages; sporophyte, which releases spores, and gametophyte, which releases gametes. Gametophyte plants are haploid, sporophyte plants diploid. This type of life cycle is called alternation of generations.
Why are charophytes closely related to plants?
Like plants, charophytes have chlorophyll a and b, store carbohydrates as starch, have cell walls consisting of cellulose, and undergo similar cell-division processes. Charophytes have unique reproductive organs that differ considerably from that of other algae.