Here is a more detailed explanation of why donkeys and horses are classified into different species according to the biological species concept:
1. Reproductive isolation: Donkeys and horses are reproductively isolated from each other, which means that they cannot interbreed and produce fertile offspring. This is due to several factors, including:
* Differences in chromosome number: Donkeys have 62 chromosomes, while horses have 64 chromosomes. This difference makes it difficult for donkeys and horses to produce viable offspring.
* Differences in reproductive anatomy: Donkeys and horses have different-sized reproductive organs, which makes it difficult for them to mate successfully.
* Behavioral differences: Donkeys and horses have different courtship and mating behaviors, which makes it difficult for them to communicate and find compatible mates.
2. Genetic distinctness: Donkeys and horses have distinct genetic profiles, which means that they are genetically different from each other. This is evident from the fact that donkeys and horses have different coat colors, body sizes, and other physical characteristics.
3. Ecological distinctness: Donkeys and horses occupy different ecological niches, which means that they live in different environments and have different ecological roles. Donkeys are native to Africa, while horses are native to Eurasia. Donkeys are typically found in dry, arid environments, while horses are more adaptable and can live in a variety of habitats.
In summary, donkeys and horses are classified into different species according to the biological species concept because they are reproductively isolated, genetically distinct, and ecologically distinct.