Pedigree Query

Thanks for the info. To my knowledge, Too Victorious has never had her heart size evaluated. I believe the pedigree program simply omits the X-factor unless it can trace it with certainty.

I have a broodmare sired by Sea Hero. Her name is Too Victorious, 1996. Her dam carried one X chromosome with the X factor. From what I know about sex-linked inheritance, my mare should have a 50% chance of getting that chromosome. Pedigree analysis charts show her as not having the X factor. How is...