Alternation of Generations in Animals from a Botanical Standpoint
نویسندگان
چکیده
منابع مشابه
Alternation of generations - unravelling the underlying molecular mechanism of a 165-year-old botanical observation.
Characteristically, land plants exhibit a life cycle with an 'alternation of generations' and thus alternate between a haploid gametophyte and a diploid sporophyte. At meiosis and fertilisation the transitions between these two ontogenies take place in distinct single stem cells. The evolutionary invention of an embryo, and thus an upright multicellular sporophyte, in the ancestor of land plant...
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Alternation of generations is a common component of all land plants, vascular and nonvascular; it does not express itself in the same manner in any other organisms. Given the other overwhelming similarities in land plant biochemistry, photosynthetic pigments and tissue organization, it seems that the easiest assumption is that they are derivatives of a common ancestor. The origin of alternation...
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15 صفحه اولSexual conflict and the alternation of haploid and diploid generations.
Land plants possess a multicellular diploid stage (sporophyte) that begins development while attached to a multicellular haploid progenitor (gametophyte). Although the closest algal relatives of land plants lack a multicellular sporophyte, they do produce a zygote that grows while attached to the maternal gametophyte. The diploid offspring shares one haploid set of genes with the haploid mother...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1905
ISSN: 0006-8071
DOI: 10.1086/328599