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Unformatted text preview: nges. Asexual: through “budding” or fragmentation
Sexual: most sponges are hermaphrodites but not selffertilizing Most sponges are hermaphrodites but not self-fertilizing:
sperm and eggs produced at different times (from
choanocytes or other cells in the sponge body—no
specialized gonads). How do they reach the egg? located in mesohyl (interior)
- asexual: budding/fragmentation
- sexual: hermaphrodites (produces both sperm and eggs)
but not self-fertilizing (sperm and eggs are produced at
different times) 7 Sexual reproduction in sponges
- Sperm is captured by choanocyte (by a feeding mechanism)
- However, the choanocyte loses its collar and flagellum and
goes through the mesohyl as an ameboid and transports the
sperm to the egg
Sponge features: biology
How do sponge sperm reach the egg? They need to cross the
cellular barrier of choanocytes; enter the mesohyl; locate the
egg; and fertilize it.
Brusca & Brusca (1990): “This rather impressive feat
initially involves sperm capture by choanocytes and
enclosure in an intracellular vesicle (much like the formation
of a food vacuole d...
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This note was uploaded on 08/07/2012 for the course BIS BIS 2C taught by Professor 3differentprofs during the Spring '09 term at UC Davis.
- Spring '09