heterozygous to heterozygous breeding, chances to miss the homozygous
chance to miss it with 1 egg is 75%
chance to miss it with 2 eggs is 75% x 75% = 56%
chance to miss it with 3 eggs is 75% x 75% x 75% = 42%
chance to miss it with 4 eggs is 75%^4 = 31%
chance to miss it with 5 eggs is 75%^5 = 23%
chance to miss it with 10 eggs is 5%
chance to miss it with 20 eggs is .3%
chance to miss it with 30 eggs is .01% (1 in 10,000 chance)