scholarly journals Cytogenetic evidence for cryptic structural hybridity causing intraspecific hybrid sterility in Aegilops caudata L..

1995 ◽  
Vol 70 (3) ◽  
pp. 355-364 ◽  
Author(s):  
Shoji OHTA
Genetics ◽  
1979 ◽  
Vol 92 (4) ◽  
pp. 1141-1152 ◽  
Author(s):  
Ruth E Schaefer ◽  
Margaret G Kidwell ◽  
Anne Fausto-Sterling

ABSTRACT A type of intraspecific hybrid sterility, between two strains of Drosophila melanogaster, referred to as GD (gonadal dysgenesis) sterility, is observed when females from a type of strain called M are crossed with males from a second type called P. Absence of egg-laying is characteristic of female GD sterility and its manifestation is conditional on high developmental temperatures. Morphological and cytological studies of GD sterile females are described. These individuals were normal in body size and external appearance. No defects in sperm storage were observed. Both adult and larval ovaries were drastically reduced in size in comparison with control ovaries. This ovarian dysgenesis was sometimes unilateral, but more frequently it was bilateral, particularly in females developing at the highest test temperature. The ovarioles of dysgenic ovaries contained no vitellaria; the germaria lacked any cells resembling the cystocyte clusters of normal ovaries. I t is concluded that sterility results from an early blockage in ovarian development, rather than from atrophy of previously developed structures. Possible mechanisms for this developmental arrest are discussed.


Genetics ◽  
1980 ◽  
Vol 94 (1) ◽  
pp. 115-133 ◽  
Author(s):  
Thomas C Kaufman ◽  
Ricki Lewis ◽  
Barbara Wakimoto

ABSTRACT Cytogenetic evidence is presented demonstrating that the 84A-B interval in the proximal portion of the right arm of chromosome 3 is the residence of a homoeotic gene complex similar to the bithorax locus. This complex, originally defined by the Antennapedia (A n t p) mutation, controls segmentation in the anterior portion of the organism. Different lesions within this complex homoeotically transform portions OI the prothorax, proboscis, antenna and eye and present clear analogies to similar lesions within the bithorax locus.


2010 ◽  
Vol 13 (2) ◽  
pp. 186-192 ◽  
Author(s):  
Yidan Ouyang ◽  
Yao-Guang Liu ◽  
Qifa Zhang
Keyword(s):  

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