The bottom line is, in the racing world, a âniceâ horse is not as important as a âwinningâ horse. Below: Mountain Horses must be certified for both gait and temperment before breeding, to ensure the best traits get passed on to the next generation.
Exceptions to these generalisations happen in the cases of XX males or XY females, or other syndromes. This system is in contrast with the ZW sex-determination system found in birds, some insects, many reptiles, and other animals, in which the heterogametic sex is female.
Sex identification is an important part of generating a DNA profile. To determine sex from nDNA, analysts use the fact that females have two X chromosomes and males have one X and one Y chromosome to target genes that differ between males and females. Three common techniques in forensics focus on the SRY gene, the amelogenin gene and repetitive sequences on the Y-chromosome (Y-STR).