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<br />Table 2. All crosses (N=72) using replicates to evaluate relative viability of <br />F2 progeny and backcrosses*. <br /> <br />Males <br /> <br />F <br /> <br /> B1 B2 Rl R2 HI H2 <br />B1 B1xBl B2xB1 RlxBl R2xBl H1xB1 H2xBl <br />B2 BlxB2 B2xB2 R1x_B2 R2xB2 H1xB1 H2xB1 <br />R1 B1xRl B2xR1 R1xR1 R2xR1 H1xRl H2xR1 <br />R2 B1xR2 B2xR2 R1xR2 R2xR2 H1xR2, H2xR2 <br />H1 BlxHl B2xH1 R1xHl R2xH1 H1xH1 H2xHl <br />H2 B1xH2 B2xH2 R1xH2 R2xH2 H1xH2 H2xH2 <br />BH BlxBH B2xBH R1xBH R2xBH H1xBH H2xBH <br />HB B1xHB B2xHB R1xHB R2xHB H1xHB H2xHB <br />BR BlxBR B2xBR R1xBR R2xBR H1xBR H2xBR <br />RB B1xRB B2xRB R1xRB R2xRB H1xRB H2xRB <br />HR B1xHR B2xHR R1xHR R2xHR H1xHR H2xHR <br />RH B1xRH B2xRH R1xRH R2xRH H1xRH H2xRH <br /> <br />e <br /> <br />m <br /> <br />a <br /> <br />1 <br /> <br />e <br /> <br />*B Bony tail <br />H Hwnpback <br />R = Roundtail <br /> <br />F, hybrids <br />BH Bonytail (female)- Humpback (male) hybrid <br />BR Bony tail (female) - Roundtail (male) hybrid <br />HB Hwnpback (female)- Bony tail (male) hybrid <br />RB Roundtail (female) - Bony tail (male) hybrid <br />HR = Hwnpback (female) - Roundtail (male) hybrid <br />RH Roundtail (female) - Hwnpback (male) hybrid <br /> <br />pai.red mati.ngs <br /> <br />Adults from Gila elegans and hybrid F, progeny will be used for the crosses <br />and backcrosses in study years three and four. The laboratory facilities at <br />UDWR Wahweap hatchery will be used for all possible crosses between Gila. <br />Crosses within pure species will serve as controls (Table 2). Approximately <br />500-1000 eggs from each female will be fertilized. These eggs will be placed <br />in hatching jars. <br /> <br />5 <br />