Single Nucleotide Polymorphism (SNP or "snip") data has been used to discovery associations between genotype (genes) and phenotypes (physical features).
Here is a mouse data site:
https://phenome.jax.org/
and here is some data
https://phenome.jax.org/projects/Gatti2
genotype : https://phenome.jax.org/phenomedoc?name=QTL_Archive/gatti_2014/Gatti_2014_geno.csv
phenotype: https://phenome.jax.org/phenomedoc?name=QTL_Archive/gatti_2014/Gatti_2014_pheno.csv

The phenotype has individuals as rows and phenotypes as columns. The genotype file has individuals has columns and each marker (SNP) is a row.

We attempted to discover SNP relationships to phenotypes, specifically neutrophil counts.