Skip to main content

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)