The male gonads of the domestic turkey were pretreated in hypotonic-colchicine solution and squashed for analysing the controversial microchromosomes in the karyotype. In a diplotene nucleus, besides six large bivalents with 2–6 chiasmata, there are 32 small bivalents which appear as small rings or dumb-bells. In diakinesis, at least 38 bivalents can be counted. In some of the best preserved first meiotic metaphase plates 41 elements were counted, there being no line of demarcation between the macro- and the micro-elements. Chromosome counts in 32 first meiotic plates revealed numbers between 43 and 33 with 50 per cent of plates showing 39–41 elements. It is presumed that 41 is the haploid number of chromosomes in the domestic turkey as initially recorded by Yamashina .
ASJC Scopus subject areas
- Cell Biology