Sexual and asexual reproduction of the fissiparous asteroid Coscinasterias acutispina(Stimpson)was studied in two populations(Kurosaki and Uozu)in Toyama Bay, Sea of Japan, during April 1998-March 1999(Kurosaki)and April 1998-October 1999(Uozu). A total of 96% and 87% of all starfish collecte...
asexual-and-sexual-reproduction网络无性繁殖和有性生殖;无性生殖跟有性生殖 网络释义 1. 无性繁殖和有性生殖 无性生殖,ase... ... ) sexual and asexual reproduction 有性和无性生殖 ) Asexual and sexual reproduction 无性繁殖和有性生殖 ... www.dictall.com|基于2个网页 2. 无性生殖跟有性生殖 美...
The evolution and maintenance of sexual reproduction is believed to involve important tradeoffs. Queens of social insects face a dilemma over the costs and benefits of sexual and asexual reproduction. Asexual reproduction by a queen doubles her contribution to the gene pool. However, overuse of asexu...
Sexual and asexual reproduction in vertebrates 来自 Semantic Scholar 喜欢 0 阅读量: 41 作者: BR Schmidt 摘要: The combined use of mitochondrial DNA markers and polymerase chain reaction (PCR) techniques has greatly enhanced evolutionary studies. These techniques have also promoted the discovery of ...
The order Verongida, considered to be exclusively oviparous and dioecious, exhibits great range in body form, including thin-bodied, rope- and stick-form members which have been postulated to be morphologically adapted to exploit fragmentation as an important asexual reproductive process. Here we ...
The relative contributions of sexual and asexual reproduction to the genetic structure of populations can be difficult to determine for fungi that use a mixture of both types of propagation. Nuclear RFLPs and DNA fingerprints were used to make indirect and direct measures of departures from random...
Examines the molecular relationships between sexual and apomictic pathways in Hieracium. Information on the seed formation in angiosperms; Discussion on gene expression in the stages of the development of seed structure and embryo; Interactions between sporophytic tissues and sexual and apomictic pathways....
1980 . Sexual reproduction—a rare occurrence in the life history of the complanate form of Scytosiphon (Scytosiphonaceae, Phaeophyta) from southern ... Poul,M⊘ller,Pedersen - 《British Phycological Journal》 被引量: 22发表: 2007年 The Role of Apoptosis in Normal and Abnormal Embryonic ...
The diploid karyotype can be inherited by both sexual and asexual reproduction; the triploid and mixoploid karyotypes will be inherited only by asexual ... S Tamura,I Oki,M Kawakatsu - 《Hydrobiologia》 被引量: 90发表: 1995年 Variability of ribosomal DNA sites in Festuca pratensis, Lolium ...
(i.e., alternative evolutionary/developmental outcomes) that collectively encompass much of flatworm sexual diversity, beginning with the decisions: (i) whether to be free-living or parasitic; (ii) whether to reproduce asexually or sexually; and (iii) whether to be gonochoristic (separate-...