Answer:
The organisms homeostasis
They are genetically and reproductively isolated. For the mule the specific isolation mechanism is termed as "Hybrid Inviability", where the postzygotic isolating mechanism prevents the hybrid from passing on their genes. A zygote may form with the sperm and egg, but the embryo will dies after a few cell divisions. The genetic information from male and female parents is insufficient to carry the organism through morphogenesis. *There are rare documented cases of a mule producing a viable offspring.
An organism whose cells<span> contain a nucleus surrounded by a membrane and whose DNA is bound together by proteins (histones) into chromosomes. The </span>cells<span> of</span>eukaryotes<span> also contain an endoplasmic reticulum and numerous specialized organelles not present in prokaryotes, especially mitochondria, Golgi bodies, and lysosomes.</span>
Recessive gene, both parents must give a recessive (or small letter of the phenotype, example ‘a’ and not ‘A’) gene for that genotype to be present. An example is blonde hair or blue eyes.
