Watched the video. IMO, just talking is a poor way to present genetics material. Adding pictures would be helpful. Markus Jayne has similar material in text on his web page. Adding pictures there would also be helpful but less helpful than when just using voice. See http://ballpython.ca/genetics-101/
For codominance vs. incomplete dominance, there is a technical difference in genetics texts, but the two are easy to confuse in practice. Actually, as we herpers use the term "codominance", it means something like "could be technically incomplete dominance or technically codominance, but I don't know which."
Kevin did not give any evidence to support the claim that spider is a dominant gene. So I will continue classifying it as not recessive, possibly (probably?) lethal when there are two spider genes in the gene pair.
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