Chromosomes of Bombyx mori (n = 28) and of Bombyx mandarina (n = 27) were studied cytogenetically to resolve the origin of the large M chromosome in the Japaneses type of B. In the F1 progeny from the reciprocal cross between B. Mandarina and B. Mori, the mitotic chromosome number was 2n = 55, and a chromosome configuration of 26 bivalents plus 1 trivalent was observed at metaphase I of germ cells. The trivalent chromosome consisted of the M chromosome from B. Mandarina and two chromosomes from B. When males of B.

You can also teleport on the world map in some of the games. You can teleport to a chosen location on the map.

2018.11.18, New Bombyx mandarina RNA-seq assemblies and 2 new Samia ricini RNA-seq assemblies were added. 2018.5.8, 2 new Bombyx mori RNA-seq assemblies were added. 2017.4.21, New Bombyx mori genome assembly (2016) became downloadable. 2017.1.13, New Bombyx mori GeneModels (created based on new Bombyx mori genome) were added.

Mori were mated to the F1 females, nuclei with two types of chromosome number (2n = 55 and 2n = 56) and two sets of chromosome pairs (26 bivalents plus 1 trivalent versus 28 bivalents) were observed in the metaphase I stage. Linkage analysis showed that the 14th chromosome of B. Mori was involved in these two types of chromosome segregation. This result indicates that the M chromosome in B. Mandarina arose from a fusion between a chromosome corresponding to the 14th linkage group and another, yet unidentified linkage group.