What causes the universal sterility observed in the zonkey hybrid?
Answer
Mismatched number and structure of chromosomes
The near-universal sterility found in zonkeys, similar to mules, is directly attributed to a chromosomal mismatch inherited from the two parent species. Zebras and donkeys, despite being compatible enough to produce offspring, possess different diploid chromosome counts. When the sperm and egg combine to form the zonkey zygote, the resulting cell contains an uneven and incompatible set of chromosomes. This structural difference prevents the correct pairing and segregation of chromosomes during meiosis, the essential cell division process required to produce functional gametes (viable sperm or eggs) for the next generation, thereby halting the perpetuation of the lineage naturally.
Related Questions
What are the alternative colloquial terms for a zonkey, besides zonkey?Which specific species is cited as the typical donkey parent of a zonkey?To which shared Genus must a zebra and donkey belong for a viable zonkey cross?What term describes the zonkey resulting from two different species in the same genus?What causes the universal sterility observed in the zonkey hybrid?What is the umbrella term for any hybrid involving a zebra and another equine species?Where is the zebra striping generally most prominent and darkest on a zonkey?Whose body structure tends to dominate, resulting in a sturdier build for the zonkey?What taxonomic Order includes the zonkey's parents, defined as odd-toed ungulates?Which hybrid is specifically noted as a zebra-horse cross, distinct from the zonkey?What process is halted by the chromosomal mismatch in the zonkey lineage continuation?