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Genetic variations alter gene activity in animals, creating various phenotypes. Advantageous characteristics are more likely to be passed down to the next generation, changing the genetic makeup of a population. Genes hold protein-production instructions, and alleles determine unique features. Breeding animals deliberately mates individuals with desirable genetic qualities to preserve or improve traits. Purebred breeding mates animals of the same breed to establish stable qualities, while crossbreeding mates animals from different breeds to combine complementary features. Inbreeding can lead to reduced fertility, slower growth rates, and increased disease vulnerability. Quantitative techniques have contributed to genetic advancement in domestic animals, and knowing the genes responsible for economically important features can improve selection accuracy. Immunogenetics studies the relationship between an organism's genetic makeup and its immune system, and genetic diversity is essential for populations to adapt to changing environments. Natural selection and biological evolution depend on genetic variety, and more advantageous features are transmitted to the population when creatures with environmentally chosen genes live and reproduce.