Chromosomenanalyse der Reziproken Bastarde Zwischen Pygaera Pigra und P. Curtula Sowie Ihrer Rückkreuzungsbastarde

Federley, Harry

doi:10.1007/bf02450842

Cited by 19 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accordingly, an opportunity emerges to give explanation of differences in bivalent formation in males and females of lepidopteran interspecific hybrids. For example, FEDERLEY (1931) established that in meiosis of interspecific hybrids, the maximum number of bivalents was formed in females, whereas in males, univalents were abundant. The observation can be explained on the basis of our present knowledge on events occurring during synapsis (for a review, see RASMUSSEN and HOLM 1980).…”

Section: Discussionmentioning

confidence: 99%

Cytological characteristics of chromosome behaviour during female meiosis in Sphinx ligustri L. (Sphingidae, Lepidoptera)

Nokkala

2008

Hereditas

View full text Add to dashboard Cite

Nokkala, S. 1987. Cytological characteristics of chromosome behaviour during female meiosis in Sphinx ligustri L. (Sphingidae, Lepidoptera). ‐ Hereditas 106:169–179. Lund, Sweden. ISSN 0018–0661. Received May 26,1986 The behaviour of chromosomes was studied in female meiosis of Sphinx ligustri L. (Sphingidae, Lepidoptera) by using improved cytological methods. The haploid chromosome number is n = 28. Throughout pro‐phase from pachytene until metaphase I, bivalents consist of two chromosomes aligned in parallel, i. e., meiosis is achiasmatic. All bivalents appear to be homomorphic, thus the ZW bivalent could not be identified. In early vitellogenesis, bivalents begin to associate nonhomologously via telomeres, forming a simple chain consisting of all 28 bivalents. After secondary modifications, a more complex, branched chain is produced. The branched chain configuration of bivalents is retained throughout the time when yolk is produced, and it breaks down during prometaphase. At metaphase I, only short chains are remaining. Based on present knowledge on chromosome behaviour in female meioses in different ovary types, it is suggested that the formation of the nonhomologous associations of biVdlentS is a prerequisite for karyosome or karyosphere formation, the karyosome being meiotically a resting stage. The effects of nonhomologous associations of bivalents on segregation are discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

Cytological characteristics of chromosome behaviour during female meiosis in Sphinx ligustri L. (Sphingidae, Lepidoptera)

Nokkala

2008

Hereditas

View full text Add to dashboard Cite

show abstract

“…Nevertheless, interspecies hybridization takes place in the wild and allows the exchange of mimicry adaptation between species [The Heliconius Genome Consortium, 2012]. Federley also found that backcrosses between hybrid females and males of the parental species generated triploid offspring [Federley, 1931] in which the 2 homologous sets of chromosomes formed bivalents during meiosis, with the third set of chromosomes remaining unpaired. Based on this finding, he predicted that if the sterility of the triploids could be overcome, it would be possible to obtain fertile tetraploids.…”

mentioning

confidence: 99%

Meiosis and Its Deviations in Polyploid Animals

Stenberg¹,

Saura²

2013

Cytogenet Genome Res

View full text Add to dashboard Cite

We review the different modes of meiosis and its deviations encountered in polyploid animals. Bisexual reproduction involving normal meiosis occurs in some allopolyploid frogs with variable degrees of polyploidy. Aberrant modes of bisexual reproduction include gynogenesis, where a sperm stimulates the egg to develop. The sperm may enter the egg but there is no fertilization and syngamy. In hybridogenesis, a genome is eliminated to produce haploid or diploid eggs or sperm. Ploidy can be elevated by fertilization with a haploid sperm in meiotic hybridogenesis, which elevates the ploidy of hybrid offspring such that they produce diploid gametes. Polyploids are then produced in the next generation. In kleptogenesis, females acquire full or partial genomes from their partners. In pre-equalizing hybrid meiosis, one genome is transmitted in the Mendelian fashion, while the other is transmitted clonally. Parthenogenetic animals have a very wide range of mechanisms for restoring or maintaining the mother's ploidy level, including gamete duplication, terminal fusion, central fusion, fusion of the first polar nucleus with the product of the first division, and premeiotic duplication followed by a normal meiosis. In apomictic parthenogenesis, meiosis is replaced by what is effectively mitotic cell division. The above modes have different evolutionary consequences, which are discussed. See also the sister article by Grandont et al. in this themed issue.

show abstract

“…The two cases of doubly divided univalents which this explanation will not cover are those found in Pygaera and Ribes hybrids (Federley 1931;Meurman 1928). In the first we have genetical evidence th a t the chromo some thread itself divides a second time.…”

Section: D-double Division Of Univalentsmentioning

confidence: 85%

The external mechanics of the chromosomes VI—The behaviour of the centromere at meiosis

Upcott

1937

Proc. R. Soc. Lond. B

View full text Add to dashboard Cite

In an attempt to analyse the forces governing the movements of chromosomes during division, variations from one cell to another and from one organism to another provide the only satisfactory method we know of determining the variables concerned, in short, of defining a “normal”. By methods such as these it has been established that the same forces act in mitosis as in meiosis, and are merely co-ordinated differently. In meiosis the co-ordination is more complex and delicately balanced than in mitosis. It is therefore more easily disturbed, and its variations are more frequent and of many different kinds. Moreover, even if lethal to their products, they are not lethal to the organism, as even slight variations of mitosis usually are; hence they are more easily studied. Each of these kinds of variation may give a clue to some problem which in the “normal” remained obscure or unnoticed. Each is a natural experiment which, while not usually disturbing the process so far as to cause death as man-made experiments often do, leads us by comparison to a further understanding of the normal. The variations may be of several kinds. They may be determined by the possession of an abnormal genotype (Darlington and Thomas 1937), or by structural or numerical changes in the chromosomes. They will affect all the cells undergoing meiosis although perhaps in varying degrees. A further set of variations consists in temporary and environmental abnormalities affecting single cells or groups of neighbouring cells.

show abstract

Chromosomenanalyse der Reziproken Bastarde Zwischen Pygaera Pigra und P. Curtula Sowie Ihrer Rückkreuzungsbastarde

Cited by 19 publications

References 7 publications

Cytological characteristics of chromosome behaviour during female meiosis in Sphinx ligustri L. (Sphingidae, Lepidoptera)

Cytological characteristics of chromosome behaviour during female meiosis in Sphinx ligustri L. (Sphingidae, Lepidoptera)

Meiosis and Its Deviations in Polyploid Animals

The external mechanics of the chromosomes VI—The behaviour of the centromere at meiosis

Contact Info

Product

Resources

About