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Table 1 Karyotypic composition of 16 Cytoraces along with their parental crosses and the contribution of parental chromosomes in the evolution of the nasuta-albomicans complex of Drosophila. The superscripts 'n' and 'a' indicate the chromosomes derived from 'D. n. nasuta' and ' D. n. albomicans' parents respectively. O = Okinawan and T = Thailand strains of D. n. albomicans. (Roman numbers in bracket denote the Cytorace groups based on number of chromosomes contributed by D. n. nasuta and D. n. albomicans).

From: Evolutionary experimentation through hybridization under laboratory condition in Drosophila: Evidence for Recombinational Speciation

Parents and the cross Races Karyotypes Chromosomes of
    nasuta albomicans
  D. n. nasuta (N) ♂ - 2n = 8 - 2n2n Xn Yn 3n 3n 4n 4n ♀ - 2n = 8 - 2n 2n Xn Xn 3n 3n 4n 4n 16 0
  D.n. albomi cans (A) ♂ - 2n = 6 - 2a2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2a 2a X3a X3a 4a 4a 0 12
N♂ X A(O)♀ Cytorace 1 (C 1) ♂ - 2n = 7 - 2n 2a X3a Yn 3n 4n 4n ♀ - 2n = 6 - 2n 2a X3a X3a 4n 4n 8 5 (I)
A(O)♂ X N♀ Cytorace 2 (C 2) ♂ - 2n = 6 - 2n 2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 2 10 (II)
N♂ X A(T)♀ Cytorace 3 (C 3) ♂ - 2n = 8 - 2n 2a Xn Yn 3n 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a4a 10 6 (III)
A(T)♂ X N♀ Cytorace 4 (C 4) ♂ - 2n = 7 - 2n 2a Y3a Xn 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a 4a 8 7 (IV)
C1♂ X A(T)♀ Cytorace 5 (C 5) ♂ - 2n = 7 - 2n 2a X3a Yn 3n4a4a ♀ - 2n = 6-2n2a X3a X3a4a4a 4 9 (V)
C4♂ X C1♀ Cytorace 6 (C 6) ♂ - 2n = 7 - 2n 2a Y3a Xn 3n 4n 4n ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4n 4n 12 3 (VI)
C1♂ X C2♀ Cytorace 7 (C 7) ♂ - 2n = 7 - 2n 2a X3a Yn 3n4a4a ♀ - 2n = 6 -2n2a X3a X3a4a4a 4 9 (V)
C1♂ X C4♀ Cytorace 8 (C 8) ♂ - 2n = 7 - 2n 2a X3a Yn 3n 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 4 9 (V)
C2♂ X N♀ Cytorace 9 (C 9) ♂ - 2n = 6 - 2n 2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 2 10 (II)
C3♂ X N♀ Cytorace 10 (C 10) ♂ - 2n = 8 - 2n 2a Xn Yn 3n 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a 4a 10 6 (III)
C2♂ X A♀ Cytorace 11 (C 11) ♂ - 2n = 6 - 2n 2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 2 10 (II)
A♂ X C1♀ Cytorace 12 (C 12) ♂ - 2n = 6 - 2n 2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 2 10 (II)
A♂ X C2♀ Cytorace 13 (C 13) ♂ - 2n = 6 - 2n 2a X3a Y3a 4a 4a ♀ - 2n = 6 - 2n 2a X3a X3a 4a 4a 2 10 (II)
C4♂ X C3♀ Cytorace 14 (C 14) ♂ - 2n = 7 - 2n 2a Y3a Xn 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a 4a 8 7 (IV)
C3♂ X C4♀ Cytorace 15 (C 15) ♂ - 2n = 8 - 2n 2a Xn Yn 3n 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a 4a 10 6 (III)
N ♂ X C3♀ Cytorace 16 (C 16) ♂ - 2n = 8 - 2n 2a Xn Yn 3n 3n 4a 4a ♀ - 2n = 8 - 2n 2a Xn Xn 3n 3n 4a 4a 10 6 (III)