Question

describe with diagram the sexual reproduction in mucor​

Answer 1

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Sexual reproduction takes place during unfavourable condition by means of gametangial copulation. The gametangia look alike and by conjugation, they give rise to zygospore. Most of the spe­cies of Mucor are heterothallic (M.-mucedo, M. hiemalis), but few species (M. tenuis, M. genereosis) are homothallic.

In heterothallic species, zygospores are pro­duced by the union of two gametangia deve­loped from mycelia of compatible strains; whereas, in homothallic species, the uniting gametangia develop from mycelia that derived on germination of a single spore.

When two mycelia of compatible strains come close to each other, the mycelia produce small outgrowth, called progametangia. The apical region of the two progametangia come in close contact. Nuclei and cytoplasm of each progametangium push more and more towards the apical region and its tip swells up with dense protoplasm.

The rear region becomes vacuolated. A septum is laid down, separating the apical regi­on, which is called gametangium; and the basal region is called suspensor. The undi­fferentiated multi-nucleate protoplast of the game­tangium is called aplanogamete or coenogamete.

After maturation of gametangia, the com­mon wall at the point of their contact dissolves and the protoplast of both the gametangia unite to form zygospore. The nuclei of opposite gametangia fuse together to form diploid (2n) nuclei, unpaired nuclei gradually degenerate.

Please see attachment for figure....

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