Cytological evidence of constant tetraploidy in the bisexual South American frog Odontophrynus americanus


Odontophrynus americanus has 2n=44 chromosomes in somatic and gonad cells which can be ordered in 11 groups of homologues. In spermatocytes I they form mostly ring quadrivalents. In metaphase II 22 dyads are present. There is no indication of abnormalities in ♂ and ♀ gonad development. 
DOI: 10.1007/BF00293683


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