Question

what is formed when there is a crossing btw female donkey and male horse

Answer 1

Hey

This process is known as cross breeding.

The unknown animal which will formed is the combination of genes of female donkey and of male horse.

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Answer 2

The correct answer is hinny.  

A domestic equine hybrid known as a hinny refers to the offspring of a stallion, a male horse, and a jenny, that is, a female donkey. It is the reciprocal cross to the more familiar mule that is the outcome of a jack, a male donkey, and a mare, a female horse.  

It is tough to produce hinnies due to the variations in the number of chromosomes of the donkey and the horse. A donkey comprises 62 chromosomes, while a horse exhibits 64 chromosomes. Being hybrid, hinnies possesses 63 chromosomes and are infertile.