Sexually dimorphic development of the gonad is essential for germ cell development and sexual reproduction. We have found that the Drosophila embryonic gonad is already sexually dimorphic at the time of initial gonad formation. Male-spec... TJ Defalco,G Verney,AB Jenkins,... - 《Developmental C...
The other pattern was more gradual and was observed in growing cultures; during successive cell divisions a frustule constriction appeared and intensified, one chloroplast split into two, and part of the protoplast aborted. A simple naming system is proposed for mating types in pennate diatoms. ...
interdependent temperature sensing and signaling. Seedling roots can sense and respond to temperature in a shoot-independent manner, whereas shoot temperature responses require both local and systemic processes. The induction of cell elongation in hypocotyls requires temperature sensing in cotyledons, followe...
Similarly, male sexual jealousy is another evolved psychological mechanism that hasn’t quite caught up to modern times. It solved the adaptive problem of reproduction in the ancestral environment by allowing men who possessed it to maximize paternity certainty and minimize the possibility of cuckoldry...
The advent of the latest generations of mobile communication technologies has brought about some major changes in personal lives and the society as a whole, resulting in that, nowadays, people are accessible to each other merely through cellphones, exceeding the limit of time and space. The round...
For cells during the first billion years, death, when it occurred, was accidental; there was nothing programmed into them that said they must die. But fierce competition gradually led to multicellular animals--size being an advantage against predators--and with this change came cell specialization...
Mont. populations in the Mojave Desert, Nevada, U.S.A., over a period of 4 years revealed that the sporophyte cohort i... LR Stark - 《Canadian Journal of Botany》 被引量: 112发表: 2002年 Germ cell proliferation and apoptosis during different phases of swordfish (Xiphias gladius L.) ...
Scattered elsewhere in the old archegonium are a variable number of nuclei that were not incorporated in the cellular proembryo. The cellular proembryo does not differentiate into embryo and suspensor but into four regions: a basal meristem whose outer layer of cells eventually forms a conspicuous...
Of genetic recombinations, during the processes of cell division and reproductive strategies, which result in a broad adaptive plasticity, both biological and ecological. All this becomes possible through the playback, where also if there is a great diversity of forms, even if there is a pattern...
Wee 1 is one of the genes which regulates the cell cycle. cDNA encoding a Wee1-homolog has been isolated from Japanese silver crucian carp (ginbuna) by using polymerase chain reaction (PCR) techniques. The cDNA obtained from the ovary tissue encoded a protein of 526 amino acids and the de...