DEVELOPMENTAL CHARACTERISTICS OF SPERM NUCLEUS OF ARTIFICIALLY SEX-REVERSED ALLOGYNOGENETIC CRUCIAN CARP IN AMPHIMICTIC AND GYNOGENETIC OOPLASMS AND THEIR PRACTICAL SIGNIFICANCE

Our experimental results showed that the sperm of functional males of allogynogenetic crucian carp induced by the administration of methyltestosterone to young genetic females could fertilize the egg of amphimictic common carp and transform into male pronucleus normally. But after the beginning of cleavage some unusual phenomena were observed such as elimination of nuclear material, multipolar division etc., which confirmed the hypothesis of chromosome incompatibility we proposed before. Beyond expectation, the sperm nucleus of sex-reversed allogynogenetic crucian carp could partially transform into male pronucleus in the egg of gynogenetic crucian carp. Its development was slower than that of female nucleus. According to the hypothesis of double control, we are preliminarilly of the opinion that the sperm of sex-reversed allogynogenetic crucian carp was not inhibited by primary control when it entered the gynogenetic egg, probably due to the lack of a certain specific factor in the sperm because of the genetically female basis. Owing to the presence of secondary control in the gynogenetic egg cytoplasm, the deconden sed sperm nucleus could not transform into male pronucleus completely.