By adopting the method based on colchicine-hypotonic-air drying technique with bone marrow cells, the paper presents the chromosome of four egg-type fowl breeds. The diploid chromosome 2n=78, chromosomal morphology ar...By adopting the method based on colchicine-hypotonic-air drying technique with bone marrow cells, the paper presents the chromosome of four egg-type fowl breeds. The diploid chromosome 2n=78, chromosomal morphology are very similar and sex chromosome type are ZZ (♂) and ZW(♀) in four egg-type fowl breeds. According to standard of Leven in 1964, the euchromosome and sex chromosome of four breeds are measured and compared in relative length arm ratio and centromere index of each chromosome including all the microchromosome. The morphology of these chromosome is described as follows: pair1, 2, 8 and ZW are metacentric, pair 4 and 6 are submetacentric, and the rest is telocentric.展开更多
Multiple BAC-FISH is a powerful tool for modern cytogenetic researching in both animals and plants.But in cotton,this technique is unavailable due to the high percentage of repetitive sequences.
文摘By adopting the method based on colchicine-hypotonic-air drying technique with bone marrow cells, the paper presents the chromosome of four egg-type fowl breeds. The diploid chromosome 2n=78, chromosomal morphology are very similar and sex chromosome type are ZZ (♂) and ZW(♀) in four egg-type fowl breeds. According to standard of Leven in 1964, the euchromosome and sex chromosome of four breeds are measured and compared in relative length arm ratio and centromere index of each chromosome including all the microchromosome. The morphology of these chromosome is described as follows: pair1, 2, 8 and ZW are metacentric, pair 4 and 6 are submetacentric, and the rest is telocentric.
文摘Multiple BAC-FISH is a powerful tool for modern cytogenetic researching in both animals and plants.But in cotton,this technique is unavailable due to the high percentage of repetitive sequences.
