| 词汇 | gametophyte |
| 释义 | BETA Examples of gametophytegametophyte isn’t in the Cambridge Dictionary yet. You can help! The control of female and male gametophytes on seed development has been identified in many studies. Segregation distortion favours genes with high fitness in the gametophyte and the young zygote, but does not necessary affect genes that control fitness components later in life. All land plants, and most multicellular algae, have life cycles in which a multicellular diploid sporophyte phase alternates with a multicellular haploid gametophyte phase. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gametophytes grow from haploid spores after sporic meiosis. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In these plants, the embryo is a young plant that grows attached to a parental gametophyte. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Gametophytes have substantial asexual reproduction by fragmentation, producing much of the living material in sphagnum peatlands. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Becoming triploid or polyploid are later evolutionary steps of this primary gametophyte. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These spores develop, through mitosis, into small, multicellular haploid gametophytes, male and female. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Some early plants may have had heteromorphic alternation of generations, with later acquisition of isomorphic gametophytes in certain lineages. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The sporophyte creates spores via meiosis which "also" then divide mitotically producing haploid individuals called gametophytes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gametophytes remain attached to and part of the sporophyte. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gametophytes are brown to white, cylindric, and repeatedly branched. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The female gametophyte protrudes from the megaspore and bears a small number of archegonia, each containing a single egg. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This species consists solely of photosynthetic gametophytes that reproduce asexually. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This theory implies that the first sporophytes bore a very different morphology to the gametophyte they depended on. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The gametophytes of all vascular plant groups evolved to become reduced in size and prominence in the life cycle. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Doing so would be difficult nonetheless, as this type of gametophyte grows only underground, years after a disturbance has taken place. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In gymnosperms, such as conifers, the food storage tissue (also called endosperm) is part of the female gametophyte, a haploid tissue. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Liverworts, mosses and hornworts spend most of their lives as gametophytes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The spores are released and germinate to produce short, thin gametophytes that are typically heart shaped, small and green in color. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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