scholarly journals THE CYTOGENETIC STUDY OF CROSSING OVER IN INTERSPECIFIC HYBRIDS BETWEEN DROSOPHILA VIRILIS AND D. TEXANA

Genetics ◽  
1976 ◽  
Vol 83 (2) ◽  
pp. 355-360
Author(s):  
M B Evgen'ev
Keyword(s):  
Interspecific Hybrids ◽  
Cytogenetic Study ◽  
Genetic Exchange ◽  
Drosophila Virilis ◽  
Crossing Over ◽  
Main Criterion ◽  
Heterozygous Condition ◽  
Series Of Experiments ◽  
Single Cluster

ABSTRACT Spontaneous crossing over was studied by means of combined cytological and genetic methods in F1  Drosophila virilis x D. texanafemales (series I) and in D. virilis females carrying a D. texana fifth chromosome in heterozygous condition (series II). The main criterion utilized to distinguish the oogonial crossovers from the meiotic ones is the identity of cytological positions of genetic exchange in crossovers constituting a cluster. Five clusters of crossovers with identical positions of exchange were found in the first series of experiments. In the second series of experiments not a single cluster of crossovers resulting from oogonial crossing over was found.

scholarly journals Crossing-over in the Male of Drosophila virilis

CYTOLOGIA ◽  
1935 ◽  
Vol 6 (2-3) ◽  
pp. 190-194 ◽  
Author(s):  
H. Kikkawa
Keyword(s):  
Drosophila Virilis ◽  
Crossing Over

scholarly journals Cytogenetic study of F1 interspecific hybrids of the section Helianthus

Helia ◽  
2007 ◽  
Vol 30 (47) ◽  
pp. 51-59
Author(s):  
T.A. Dolgova ◽  
L.L. Yushkina ◽  
V.N. Popov
Keyword(s):  
Interspecific Hybrids ◽  
Cytogenetic Study

scholarly journals Male Recombination in Dysgenic Hybrids of Drosophila Melanogaster: Chromosome Breakage or Mitotic Crossing-Over?

1978 ◽  
Vol 31 (3) ◽  
pp. 303 ◽  
Author(s):  
JA Sved
Keyword(s):  
Drosophila Melanogaster ◽  
Chromosome Breakage ◽  
Mitotic Recombination ◽  
Large Series ◽  
Crossing Over ◽  
Equal Frequency ◽  
Male Recombination ◽  
Recombination Model ◽  
Series Of Experiments ◽  
Balancer Chromosome

Recombinant second chromosomes from dysgenic male hybrids of D. melanogaster have been made homozygous using a Curly balancer chromosome technique. Most of the chromosome homozygotes produced have apparently normal viability. The incidence of newly produced lethals, while as high as 5-10%, is not significantly higher than in non-recombinant chromosomes. Thus male recombination and mutation appear to occur independently of each other, rather than in the same gametes as would be expected if both were simultaneously produced by chromosome breakage and reunion. Furthermore, a summary of recombination clusters over a large series of experiments suggests that reciprocal and non-reciprocal clusters occur with approximately equal frequency. This is in agreement with predictions from a four-strand mitotic recombination model.

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