I recall some readings I did a while back that stated offspring-parent was in fact a much worse breeding than sib-sib. It was approximately: the offspring from offspring-parent would have identical gene copies for 50% of the genes, and sib-sib would be something like 37.5%.

I tried to dig up that page and couldn't find it.

Then I tried to do my own punnet square experiment to determine how many identical gene pairs offspring under the two breedings would have, and I keep arriving at sib-sib has more identical gene pairs.

Can anyone resolve this?

JonV