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Chromosomal polymorphism in Cassida syrtica Boh. (Coleoptera: Chrysomelidae)
Cytobios
|January 1, 1979
Summary
Intraspecific polymorphism in Cassida syrtica involves an extra autosome, termed a marker chromosome. This chromosomal variation affects both diploid and haploid sets in this insect species.
Area of Science:
- * Entomology
- * Cytogenetics
- * Evolutionary Biology
Background:
- * Intraspecific variation in chromosome number can impact species evolution.
- * Cassida syrtica, a species of tortoise beetle, exhibits unique chromosomal characteristics.
Purpose of the Study:
- * To document and describe the intraspecific chromosomal polymorphism in Cassida syrtica.
- * To characterize the karyotype of both normal and polymorphic forms of the species.
Main Methods:
- * Karyological analysis of Cassida syrtica specimens.
- * Microscopic examination of chromosome sets in diploid and haploid cells.
Main Results:
- * Observed intraspecific polymorphism in autosomes within Cassida syrtica.
- * Identified an additional large autosome (marker chromosome) in polymorphic individuals.
- * Normal karyotype: 18 chromosomes (n = 8 + Xyp); polymorphic karyotype: 19 chromosomes (n = 8 + 1 Mt + Xyp).
Conclusions:
- * Cassida syrtica displays significant chromosomal polymorphism.
- * The presence of a marker chromosome represents a notable deviation in the karyotype of this species.