Question

how diploid ulva produced haploid zoospores and why?

Answer 1

Answer:

The diploid adult plant produces haploid zoospores by meiosis, these settle and grow to form haploid male and female plants similar to the diploid plants. When these haploid plants release gametes they unite to produce the zygote which germinates, and grows to produce the diploid plant.

Answer 2

Ulva has two morphologically identical multicellular adult phases: haploid gametophyte and diploid sporophyte.

Sporophyte of Ulva is diploid:

• Diploid sporophytes generate haploid zoospores, which mature into gametophytes.
• Haploid gametes are produced by haploid gametophytes.
• A zygote is generated when a "+" and a "-" gamete combine and develop into a diploid sporophyte.
• Diploid sporophytes generate haploid zoospores, which mature into gametophytes.
• Haploid gametes are produced by haploid gametophytes.
• Current cytological and biochemical studies of meiotic and mitotic zooid development in Ulva revealed that partheno-sporophytes of the mating type plus had normal meiosis during zoospore creation.
• Ulva species are all isomorphic, having similar morphologies alternating between gametophytic and sporophytic life stages.
• The sporophytes are diploid (2n) and the gametophytes are haploid (n).
• Ulva has a relatively simple multicellular organization that can give rise to a variety of somewhat complex morphologies via phenotypic plasticity.

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