A group of horses with the same specific characteristics is called a breed. The photograph shows a horse of the rare breed Akhal-Teke that originated in Turkmenistan. The Akhal-Teke population is in danger from inbreeding. (Source: © Heat Design / Alamy Stock Photo) A scientist calculated the heterozygosity index of a population of 5457 Akhal-Teke horses to be 0.661 . How many of these horses are heterozygotes? (1)

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