Question

How does the gamete present in cladophora, fucus and human being differentiate from each other

Answer 1

Cladophora is a genus of reticulated filamentous Ulvophyceae (green algae). The genus Cladophora contains many species that are very hard to tell apart and classify, mainly because of the great variation in their appearances, which is affected by habitat, age and environmental conditions.[1] Unlike Spirogyra the filaments of Cladophora branch and it doesn't undergo conjugation. There are two multicellular stages in its life cycle - a haploid gametophyte and a diploidsporophyte - which look highly similar. The only way to tell the two stages apart is to either count their chromosomes, or examine their offspring. The haploid gametophyte produces haploid gametes by mitosis and the diploid sporophyte produces haploid spores by meiosis. The only visible difference between the gametes and spores of Cladophora is that the gametes have two flagella and the spores have four. The Cladophora species can be a major nuisance causing major alteration to benthic conditions linked particularly with increased phosphorusloading.

Answer 2

The gamete present in cladophora, fucus and human beings differ from each other in the way that gamete present in cladophora are of isogamous types whereas in fucus it is of oogamous type. Humans mainly have heterogametes.

Explanation:

• Isogamous sexual reproduction occurs when the male and female gametes have comparable morphologies like identical size and shape. These types of gamete are found in cladophora.
• Oogamous is a form of anisogamous in which the female gamete is much larger than the male. The female gamete is stationary, but the male gamete moves around.
• Oogamous type gamete is found in fucus.
• Heterogamete is the situation in which two types of sex cells or gametes are involved in the reproductive process. It is found in human beings.
• The female reproductive system possesses a female reproductive gamete called ovum whereas the male reproductive system possesses the male reproductive gamete called sperm.

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