When I was a bio major in college, I was taught to do punnett squares that made matching pairs. For example, if we are breeding an albino x spider, you would list AAss for the albino, and aaSs for the spider. You can skip pastel, because it doesn't come into play at all. That way the offspring show up as AaSs or Aass rather than AS or As, which could make it look like the albino and spider genes are paired on the same allele, even though they aren't.
The way I was saying to do it would not yield AS or As, but rather AaSs and Aass like you said.
Originally Posted by kc261
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