Analysis of semen samples of male germline chimeras produced by transfer of female and male gonadal germ cells collected from 7-day-old embryonic gonads. DNA was extracted from the sperm samples and analyzed for the presence of (A) dominant white-specific repeat sequences by PCR with dominant white-specific primers and (B) recessive allele-specific repeat sequences by PCR with recessive allele-specific primers. Lane 1, control (White Leghorn sperm DNA); lane 2, control
(Rhode Island Red sperm DNA); lane 3, negative control (water); lane 4, ID no. F→M2 (male germline chimera produced by transfer of female gonadal germ cells); lane 5, ID no. M→M3; lane 6, ID no. F→M6; lane 7, ID no. M→M7; lane 8, ID no. M→M8.