[R. Scott]

If each African Antelope produce offspring per individual over an average lifetime of 10 years, and we have a population that is maintained at 24,000 individuals over time, how many spontaneous non-lethal mutations would enter the gene pool after a period of 1,000 years?"

What is missing is the birthrate. Without that there can be no attempt at an answer.

[dawn53]

Sorry, it's in post two, 5 births per lifetime per antelope.