EFFECTS OF X-RAYS UPON HAPLOID AND DIPLOID EMBRYOS OF HABROBRACON

Genetic Effects of X-Rays and Cathode Rays on Oocytes of Habrobracon.

IFFERENCES in sensitivity of oocytes to X-irradiation depending upon stage in meiosis when treatment occurred, have been shown for a number of organisms including Habrobracon (WHITING l938,1941,1945a, 1945b; ATWOOD, VON BORSTEL and WHITING 1956). Studies have also shown that death of Habrobracon embryos following irradiation of oocytes in late metaphase and in late prophase (diplotene) was attr...

Cell Number in Haploid, Diploid and Polyploid Mouse Embryos

the effects of planning on accuracy and complexity of iranian efl students’ written narrative task performance

this study compared the different effects of form-focused guided planning vs. meaning-focused guided planning on iranian pre-intermediate students’ task performance. the study lasted for three weeks and concentrated on eight english structures. forty five pre-intermediate iranian students were randomly assigned to three groups of guided planning focus-on-form group (gpfg), guided planning focus...

The evolution of haploid, diploid and polymorphic haploid-diploid life cycles: the role of meiotic mutation.

Here I present a simple population genetic model to investigate the evolution of polymorphic haploid-diploid life cycles. The key feature of the model is the assumption of mutation occurring during meiosis. I show that, in addition to regions favoring haploid or diploid life cycles, there are substantial regions of the parameter space under which polymorphic haploid-diploid life cycles are expe...

Haploid-Diploid Algorithms

This paper uses the recent idea that the fundamental haploid-diploid lifecycle of eukaryotic organisms implements a rudimentary form of learning within evolution. A general approach for evolutionary computation is here derived that differs from all previous known work using diploid representations. The primary role of recombination is also changed from that previously considered in both natural...