Question

Explain the triphesic life cycle of polysiphonia

Answer 1

Answer: This may help you

Explanation:

Triphasic life cycle: example of Polysiphonia. Red algae are haplo-diplonts with a complicated life cycle that often involves three phases. Characteristical for Red algae is that no motile stage occurs during the entire life cycle. The spores and gametes are transported by the water in a passive manner.

Polysiphonia : Life Cycle • The life cycle of Polysiphonia is triphasic and haplo- diplobiontic. Three different phases in the life cycle :

i) Haploid phase represented by the male and female gametophytes

ii ) Diploid phase represented by carposporophyte (Cystocarp)

iii ) Diploid phase represented by tetrasporophyte.

The life cycle is triphasic and involves an alternation of two diploid (2x) or sporophytic generations. i.e. carposporophyte and tetrasporophyte with one haploid (x) or gametophytic generation. Thus there are two diploid phases and one haploid phase.