منابع مشابه
Post-zygotic sterility and cytonuclear compatibility limits in S. cerevisiae xenomitochondrial cybrids
Nucleo-mitochondrial interactions, particularly those determining the primary divergence of biological species, can be studied by means of xenomitochondrial cybrids, which are cells where the original mitochondria are substituted by their counterparts from related species. Saccharomyces cerevisiae cybrids are prepared simply by the mating of the ρ(0) strain with impaired karyogamy and germinati...
متن کاملGametic Differentiation
A structural and biochemical study is presented concerning the agglutination of gametic flagella, the initial step in the mating reaction of Chlamydomonas reinhardtii. An alteration in the distribution of the intramembranous particles revealed by freeze-fracturing of flagellar membranes is shown to accompany gametic differentiation in both mating types. The isolation and electrophoretic analysi...
متن کاملBasics of gametic imprinting.
The fundamental assumption of Mendelian genetics is that behavior of an allele is identical whether it arrives to a zygote through paternal or maternal germline pathway. Gametic imprinting phenomena discovered and studied in mammals show limitations of the classical view in special cases. Two sources of evidence were essential to describe gametic imprinting. The first approach based on genetic ...
متن کاملMaternal and Zygotic Phenotypes
The polycomb-group genes, a set of genes characterized by mutations that cause similar phenotypes and dosage-dependent interactions, are required for the normal expression of segment-specific homeotic loci. .Here we report that polycombeotic (formerly 1(3)1902), originally identified by a lethal mutation that causes a small-disc phenotype, is also a member of this group of essential genes. Adul...
متن کاملThe Effect of Epistasis and Gametic Unbalance
ENETIC load has been defined as the extent to which an equilibrium population is impaired because not all individuals are of optimum genotype. The concept, first discussed by HALDANE (1937), is the basis of theory developed by CROW (1958) and others for assessing the relative impact of various facets of the genetic system (especially mutation, segregation and inbreeding) on the average fitness ...
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ژورنال
عنوان ژورنال: Nature
سال: 1922
ISSN: 0028-0836,1476-4687
DOI: 10.1038/109391a0