Studies in Heredity. II. Further Experiments in Crossing British Species of Sea-urchins
نویسندگان
چکیده
منابع مشابه
Species-specific Sperm Adhesion in Sea Urchins
Bindin, a protein component of the acrosomal vesicle of sea urchin sperm, has been isolated from Arbacia punctulata and Strongylocentrotus purpuratus . Using this isolated bindin, we have devised a quantitative assay for bindin-mediated egg agglutination and compared the agglutination of bindin and eggs from A . punctulata and S. purpuratus . Bindin-mediated agglutination is species-specific in...
متن کاملREpROdUCTIvE ISOLATION BETwEEN SpECIES OF SEA URChINS
Existing knowledge on reproductive isolating barriers between sea urchin species is reviewed. Experiments involving artificial production of hybrids between congeneric echinoid species have shown that in most cases hybrids are viable and capable of backcrossing. Only species separated for > 5 million yrs show complete post-zygotic isolation. Each potential prezygotic isolating barrier appears t...
متن کاملConspecific sperm precedence in two species of tropical sea urchins.
Conspecific sperm precedence occurs when females are exposed to sperm from males of multiple species, but preferentially use sperm of a conspecific. Conspecific sperm precedence and its mechanisms have been documented widely in terrestrial species, in which complex female behaviors or reproductive tract morphologies can allow many opportunities for female choice and sperm competition, however, ...
متن کاملSpermine is major polyamine in sea urchins: studies of polyamines and their synthesis in developing sea urchins.
Polyamine synthesis and accumulation was studied in several species of developing sea urchins. Most striking is the presence in the gametes of a large amount of spermine, with low amounts of putrescine and spermidine. This contrasts with the pattern of polyamines present in both micro-organisms and mammals. Micro-organisms contain mainly putrescine and spermidine and adult mammalian tissues usu...
متن کاملPhylogeny and development of marine model species: strongylocentrotid sea urchins.
The phylogenetic relationships of ten strongy-locentrotid sea urchin species were determined using mitochondrial DNA sequences. This phylogeny provides a backdrop for the evolutionary history of one of the most studied groups of sea urchins. Our phylogeny indicates that a major revision of this group is in order. All else remaining unchanged, it supports the inclusion of three additional specie...
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ژورنال
عنوان ژورنال: Zeitschrift für Induktive Abstammungs- und Vererbungslehre
سال: 1915
ISSN: 1617-4615,1617-4623
DOI: 10.1007/bf01813459