Data/hora: 17/06/2024 01:09:12

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	24/03/1999	
Data da última atualização: 	07/07/2010	
Autoria: 	OHNO, S.; MURAMOTO, J.; KLEIN, J.; ATKIN, N. B.	
Afiliação: 	Department of Biology, City of Hope Medical Center, Duarte, Califonia, USA. Department of Cancer Research, Mount Vernon Hospital, Northwood, Middlesex, England.	
Título: 	Diploid-tetraploid relationship in clupeoid and salmonoid fish.	
Ano de publicação: 	1969	
Fonte/Imprenta: 	Chromosomes Today, Jerusalem, v.2, p.139-147, 1969.	
Idioma: 	Inglês	
Conteúdo: 	1. A diploid-tetraploid relationship exists among clupeoid and salmonoid fish of the Pacific.
2. The anchovy and the herring (suborder Clupeoidea) and two species of smelts (family Osmeridae, suborder Salmoidea) have DNA values which range from 21 to 43 per cent. of that in mammals. They were considered as diploid species. 
3. The rainbow trout and the coho salmon (family Salmonidae) were considered tetraploid species, for their DNA values were 80 per cent. that of mammals. 
4. As both tetraploid species maintained 104 chromosome arms, their diploid ancestor must have had a diploid complement as well as a DNA value very similar to that of the present day anchovy.
5. The anchovy has 48 acrocentric and a DNA value 43 per cent. of that in mammals. A newly arisen tetraploid species must have contained 104 acrocentrics. A series of Robertsonian fusions apparently followed. Intra-individual Robertsonian polymorphism and the formation of hexa and octavalents seen in these tetraploid species suggests that Robertsonian fusions are being utilised in their drive to achieve homologous fusions.
6. The diploid species have two separate gene loci which code for A and B subunits of lactate dehydrogenase. In  the tetraploid species, these gene loci are duplicated.	
Palavras-Chave: 	Clupeoid; Diploid-tetraploid; Salmonoid fish.	
Thesagro: 	DNA; Peixe.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (37665-1) - ADD - SP - -- - SP4294 -  - 4294 - DIS