Can female eggs be infertile?

[joelgama]

I have a pair of red turquoises and I know for sure I have a pair and they have laid eggs 3 times but all become white after 24 hrs and I am starting to suspect that is the female because I have had fry from the same male with another female and I have seen this male doing his runs fine; any thoughts?

[TURQ64]

most eggs are viable, there isn't any 'fertility' to the egg without a sperm cell, according to my basic biology teacher..of course, I've been out of school for almost 50 years, so something might have 'changed'...