Artículos de revistas
Crossing over does occur in males of Drosophila ananassae from natural populations
Fecha
2012Registro en:
GENOME, OTTAWA, v. 55, n. 7, supl. 1, Part 3, pp. 505-511, JUL, 2012
0831-2796
10.1139/G2012-037
Autor
Goni, Beatriz
Matsuda, Muneo
Yamamoto, Masa-Toshi
Vilela, Carlos Ribeiro
Tobari, Yoshiko N.
Institución
Resumen
Spontaneous crossing over in males of Drosophila ananassae has been well demonstrated using F-1 individuals from crosses between marker stocks and wild type strains. However, the question of its occurrence in males from natural populations remained open. Here we present the cytological evidence that crossing over does occur in males of D. ananassae from two Brazilian populations, sampled nearly 21 years apart, and in two recently sampled populations, one from Indonesia and one from Okinawa, Japan. Cytological analysis of meiosis in males collected from nature and in sons of females from the same population inseminated in nature revealed the presence of chiasmata, inversion chiasmata, and isosite chromosome breakages in the diplotene cells in all sampled populations. These data demonstrate that reciprocal and nonreciprocal exchanges and chromosome breakages, previously reported as related events of male crossing over, do occur at variable frequencies among males from natural populations.