What is the resulting chromosome number if a Plains Zebra (44) breeds with a Horse (64)?
Answer
54 chromosomes
When considering the most common cross, such as a Plains Zebra, which possesses approximately 44 chromosomes, breeding it to a horse with 64 chromosomes results in the offspring inheriting half the complement from each parent. The horse contributes 32 chromosomes (half of 64), and the Plains Zebra contributes 22 chromosomes (half of 44), totaling 54 chromosomes in the resulting zorse. This specific number, 54, falls into the uneven range (usually 50 to 63) that prevents the necessary homologous pairing during meiosis, confirming the hybrid's infertility because the necessary pairs for successful germ cell development are absent.
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