This study was conducted to identify the genetic diversity indicators of the secreted phosphoprotein 1 (SPP1) gene in flock of local ewe's sheep in middle of Iraq. The sample was made up of 48 ewes and the duration of the study was six months. Genetic polymorphisms were identified and four SNPs (4) variants were obtained. The average allelic abundance (Na) was 2.00, the average number of alleles affected (Ne) was 1.0539, Shannon Guide (I) 0.1163. The average allelic abundance was equal in all the variations studied (2.00) and the number of alleles affected was higher in SNP2 and SNP3, both at (1.0425) compared to SNP1 (1.0211) and SNP4 (1.1096). Obs-Hom and (0.9479) are very close to Exp- Hom and (0.9492). The individua

Rodents have been studied widely to evaluate the cellular and molecular mechanism of tooth development, although significant differences exist between them that impact how the researchers design their experiment. The mandibular first molar M1 is the most studied tooth in both species and provides a model for crown morphogenesis, root initiation, periodontal ligament organization, and the tooth eruption. In mice the M1 development is rapid, the crown complete at birth and the tooth eruption postnatal P20–21, while in rats the tooth development events are delayed, with larger tooth germs and tooth eruption at P17. However, rats provide advantages for microinjection, histology and biochemical assays due to their larger molar compared to mice

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