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#budding

2 public questions tagged with this topic.

Regeneration -l

Which mutant hydra has defects in budding due to excessive head inhibition signals?

L4 mutant was isolated in Hydra vulgaris screens searching for budding pattern defects. Phenotypically L4 shows scarce budding, increased bud spacing, and prolonged head inhibition field where existing head prevents nearby secondary heads or buds. Molecularly, enhanced production or range of head inhibition signal likely involving Wnt antagonist Sp5 spreading from hypostome organizer suppresses new axes. Wnt3 mutants lack heads, SHH absent in cnidarians, Notum overexpression differs. L4 demonstrates importance of long-range inhibition ensuring single dominant organizer and properly spaced asexual reproduction maintaining body plan polarity.

Ref: Development, Hydra L4 mutant - excessive head inhibition signals disrupt budding and patterning.

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Fungi Classification

Saccharomyces cerevisiae reproduces asexually mainly by

Saccharomyces cerevisiae, commonly known as baker's or brewer's yeast, is a unicellular ascomycete where asexual reproduction predominantly involves budding, an asymmetric mitotic process producing genetically identical daughter cells. A small bud emerges on mother cell surface after S-phase, nucleus divides by mitosis, one nucleus migrates into growing bud along with cytoplasm and organelles, cytokinesis forms septum leaving chitinous bud scar. Mother continues producing multiple buds sequentially, daughter enlarges to parent size before separation. This rapid proliferation dominates sugar-rich environments like dough fermentation, differing from fragmentation, exogenous conidia formation or transverse binary fission.

Ref: NCERT Class 11 Biology Chapter 2: Fungi; Lodish Molecular Cell Biology 8th ed., Yeast Cell Cycle

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