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单词 megaspore
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Examples ofmegaspore

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As the functionalmegaspore, the megagametophyte is genetically identical to the egg cell.
From theCambridge English Corpus
The nucellus is uniseriate, contains a thin-walled seedmegaspore, and appears to be connected to the integument towards the chalaza only.
From theCambridge English Corpus
No isolated megaspores were found associated with the sporophylls.
From theCambridge English Corpus
The nucellus is poorly preserved but appears uniseriate, and is attached to the integument only at its base, and contains a thin-walledmegasporethat lacks developed megagametophyte tissues.
From theCambridge English Corpus
Within each ovule, amegasporedevelops by mitosis into a megagametophyte.
From
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The tetrasporic pattern is characterized by cell plates failing to form after either meiosis 1 or 2, and results in one four-nucleatemegaspore.
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Toward the center of each sorus and developing first are the megasporangia, each of which will produce a single large femalemegaspore.
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In gymnosperms, three of the four haploid spores produced in meiosis typically degenerate, leaving one survivingmegasporeinside the nucellus.
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Thismegasporebecomes larger and the nucleus of it undergoes mitosis three times until there are eight nuclei.
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As with all seed-plants, the lyginopteridalean ovules had just one functional seedmegasporewithin the nucellus.
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Only one is a functionalmegasporewhereas the others stay dysfunctional or degenerate.
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One kind, the megasporangium, produces only a single large spore (amegaspore).
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Within the seed coat, themegasporedevelops into a tiny gametophyte, which in turn produces one or more egg cells.
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Generally speaking, themegaspore, or large spore, germinates into a female gametophyte, which produces egg cells.
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This type of megagametophyte develops from themegasporethrough three rounds of mitotic divisions.
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The female gametophyte protrudes from themegasporeand bears a small number of archegonia, each containing a single egg.
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Three cells die and one that is most distant from the micropyle develops into themegaspore.
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The megagametophyte develops within themegasporeof extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants.
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Themegasporethat remains divides mitotically and develops into the female gametophyte (megagametophyte) which eventually produces one or more eggs.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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更新时间：2024/12/28 0:55:15