《Table 4 The number of chromosomes and the overall degree of nucleus-nucleus and nucleus-cytoplasm c

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《Establishment and application of distant hybridization technology in fish》

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a) ++++:high compatibility；+++:good compatibility；++:normal compatibility；+:poor compatibility；maternal nucleus*:the maternal nuclear material（including genome）；paternal nucleus**:the paternal nuclear material（including genome）.

The genetic rules revealed at the chromosomal level involve the matching of the chromosome numbers of the parents.The degree of matching of the chromosome number of the parents will affect the nucleus-nucleus and nucleus-cytoplasm compatibilities of hybrid F1.The nucleus-nucleus and nucleus-cytoplasm compatibilities are connected via the survival rate of hybrid F1（Figure 3；Table 4）.In hybrid F1，the nucleus-nucleus and nucleus-cytoplasm compatibilities include the maternal genome-paternal genome，the maternal genome-cytoplasm，and the paternal genome-cytoplasm compatibilities.Intraspecific hybridization is a special case of distant hybridization because the number of maternal chromosomes is equal to that of paternal chromosomes and the parents share a close genetic relationship；thus，the maternal genome-paternal genome，the maternal genome-cytoplasm，and the paternal genome-cytoplasm compatibilities are fairly good.Therefore，we can infer that the survival rate of hybrid F1from intraspecific hybridization is generally high.