Table 4. Summary of genotype frequencies in M. m. musculus backcross.

	Crosses	AA	AB	Total	%AB	P-value
Region 1	musculusCZII × PWK sire	100	93	195	47.7	0.614
140,089,156–	females	54	50	106	47.2	0.695
141,037,913 bp	males	46	43	89	48.3	0.75
	musculusPWK × CZII sire	144	157	301	52.2	0.454
	females	77	83	160	51.9	0.635
	males	67	74	141	52.5	0.556
	Total	244	250	496	50.4	0.787
Region 2	musculusCZII × PWK sire	97	97	195	49.7	1
148,602,050–	females	53	53	106	50	1
151,609,913 bp	males	44	44	89	49.4	1
	musculusPWK × CZII sire	138	162	301	53.8	0.166
	females	73	86	160	53.8	0.303
	males	65	76	141	53.9	0.354
	total	235	259	496	52.2	0.28

To test for TRD within M. m. musculus, female musculus^PWK were crossed to reciprocal interstrain F1s between musculus^CZII and musculus^PWK. Offspring were genotyped for two regions inside the introgressed TRD on Chr 4. AA and AB represent offspring genotype.