In a standard IVF protocol, the ideal ratio of sperm to egg mixed together in the petri dish is approximately:

1. During standard IVF, eggs and prepared sperm are combined together in a petri dish. 2. Because natural fertilization already requires many sperm to break down the oocyte's protective layers, a large excess is still used in vitro. 3. Seminal fluid is washed away before mixing because it contains FPP, a peptide that can block sperm capacitation at high concentration. 4. The eggs and prepared sperm are then combined at a specific, deliberately high ratio. 5. 1 sperm to one egg and 1,000 sperm to one egg are both different figures a reader might guess from memory, but neither matches the specific figure given here. 6. That ratio is 75,000 sperm to one egg; if sperm quality is very poor, intracytoplasmic sperm injection (ICSI) is used instead. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 28 "Development and Inheritance", p.1322-1323 §In Vitro Fertilization_