Table 1.

Potential backcross or F₂ genotypes of LdhA and LdhB in isolates of Daphnia pulex (X), Daphnia pulicaria (C) and their hybrids (CX).

	Genotype 2
Isolate 1	LdhA	LdhB
CX16-MB	CX	CC
CX17-SK	CX	CC
CX18-SK	CX	CC
CX05-NB	CX	XX
X34-SK	XX	CC
X32-SK	XX	CX
X33-SK	XX	CX
X30-OH	XX	CX
X35-IL	XX	CX

1. The last 2 letters are the state or province from which the isolate was collected.

2. C and X refer to allele groups from D. pulicaria and D. pulex, respectively (Figure 3).