Data/hora: 21/06/2024 01:15:22

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 22/03/1999
Data da última atualização: | 22/03/1999
Autoria: | COHEN, M. M.; GANS, C.
Título: | The chromosomes of the order Crocodilia.
Ano de publicação: | 1970
Fonte/Imprenta: | Cytogenetics, v.9, p.81-105, 1970.
Idioma: | Inglês
Conteúdo: | The somatic karyotypes of the 21 surviving species of the order Crocodilia are presented. The population surveyed totals 71 animals, with representatives of both sexes in 13 species. No karyotypic differences were observed among the multiple specimens within a given species or subspecies. There was no evidence for consistent heteromorphism that might be indicative of a sex-chromosome pair. All chromosomes possessed disntinct morphology and were classified as macrochroromosomes in the absence of an absolute distinction between macro- and microchromosomes. The diploid number in this order ranges from 30 to 42; however, the fundamental numbers (N.F.) shows only 10% variation (56 to 62). Two obvious marker chromosomes were evident - a satellited submetacentric characteristic of alligators and a telocen tric with a marked secondary constriction observed in nine species of crocodiles. Evolutionary pathways of karyotype develeopment are discussed from the consideration of both centrometric 'fusion' and 'fission'.
Palavras-Chave: | Crocodile; Cromossomo; Reptile.
Thesagro: | Crocodilo; Réptil.
Thesaurus Nal: | chromosomes.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (37559-1) - ADD - SP - -- - SP4213 -  - 4213 - DIS