Cytogenetic studies in Sinipta dalmani Stål (Orthoptera: acrididae). II. Effects of centric fusions on chiasma frequency and distribution
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چکیده
منابع مشابه
Micro-Evolution in Grasshoppers Mediated by Polymorphic Robertsonian Translocations
This review focuses on grasshoppers that are polymorphic for Robertsonian translocations because in these organisms the clarity of meiotic figures allows the study of both chiasma distribution and the orientation of trivalents and multivalents in metaphase I. Only five species of such grasshoppers were found in the literature, and all of them were from the New World: Oedaleonotus enigma (Scudde...
متن کاملEffects of Temperature on Behavior of Trimerotropis Pallidipennis (orthoptera, Acrididae)
We observed activity and behavior of Trimerotropis pallidipennis in the field and constructed time-activity budgets during June–July 2003. Grasshoppers began to walk once site temperatures (shaded air temperature 1 cm above soil surface) reached 18.6uC, foraging began once temperatures reached 24.2–31.7uC, and courtship began once temperatures reached 30.3–36.4uC. Mating and oviposition occurre...
متن کاملTwo new species of Melanoplus Stål, 1873 (Orthoptera: Acrididae: Melanoplinae) from northeastern Mexico.
Two new species of the genus Melanoplus Stål 1873 are described. M. trachodes n. sp., and M. parvus n. sp., both of which are endemic to the cool-temperate mountains of the Eastern Sierra Madre (ESM) in northeastern Mexico. Their habitat represents a transition zone between the ESM and the semiarid High Plateau Biogeographic provinces. This transition zone is characterized by an elevation range...
متن کاملChromosome polymorphisms in natural populations of the South American grasshopper Sinipta dalmani
Six populations of Sinipta dalmani from the provinces of Buenos Aires and Entre Rios (Argentina) were analyzed. The populations of “El Palmar” National Park (Entre Rios) were polymorphic for pericentric inversions in pairs M4 and M7 and for a centric fusion involving pair M5 and the X chromosome. The M4 inversion remained similar over time and the karyomorphic frequencies did not depart from th...
متن کاملon translation of politeness strategies in dialogues involving female characters in translations and retranslations of novels translated before and after the islamic revolution of iran and their effects on the image of women: a polysystem theory approach
abstract reception environment has considerable effects on accepting a translation. as the expectations of a target culture and its values and needs change throughout history, its criteria for accepting a translation or rejecting it will change accordingly (gentzler, 2001). the expectations of iran, as the reception environment in the present study, have changed after the islamic revolution. i...
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ژورنال
عنوان ژورنال: Genetics Selection Evolution
سال: 1990
ISSN: 1297-9686
DOI: 10.1186/1297-9686-22-3-263