Question

life cycle of ectocarpus

Answer 1

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The lifecycle of Ectocarpus is Haplo-Diplontic

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Answer 2

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Life cycle of Ectocarpus siliculosus. Both Ectocarpus sexual and asexual life cycles are displayed. Gametes (right side) released from WT male gametophytes (strain Ec32) are mutagenised by UVB irradiation (Le Bail and Charrier, 2013). Upon a phenotypic screen, mutants (red) are propagated 5 times asexually, by successive release of mitospores from plurilocular sporangia. Spores regenerate a mutant gametophyte, which was crossed with a WT sexual female partner (Ec568). All mutations obtained so far in Ectocarpus were shown to be recessive in the diploid sporophyte (left side) (Peters et al., 2008; Coelho et al., 2011; Le Bail et al., 2011). Meiosis generates male and female mutant or WT gametophytes. Dashed lines stand for meiospore release from unilocular sporangia, plain lines for spore or gamete release from plurilocular sporangia and gametangia respectively. Prostrate filaments and erect filaments characteristic of the general morphology of Ectocarpus siliculosus sporophyte are also displayed (left part).
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