Name:
Date:
Period:
Write Your Own Punnett Squares
We’ve learned about complete dominance, incomplete dominance, and codominance in
genetic interactions. For this assignment, you’ll create your own Punnett Square for each type
of interaction (complete dominance, incomplete dominance, and codominance). Pick a favorite
plant or animal (maybe from your biome project) or make up your own creature. Next, pick a
trait and make up two phenotypes and genotypes in whatever creature you chose.
For instance, I’d pick a tiger, where thick black stripes are dominant (B) and thin black
stripes are recessive (b) (I just made that up). In a complete dominance model, thick black
stripes (B) would always show over thin (b). In an incomplete dominance model, the two
phenotypes would blend and make medium stripes (Bb). In a codominance model, both thick
and thin stripes would be present (Bb) and maybe alternate.
Once you’ve made your selections, write and solve three Punnett Square word problems
and draw three Punnett Squares (one for each: complete dominance, incomplete dominance,
and codominance). Lastly, draw an example of what a heterozygous creature would look like for
each Punnett Square (the quality of your illustrations won’t affect your grade). Feel free to use
our previous Punnett Square worksheets as a guide. Once you’re finished, take a picture of your
work and submit it on Microsoft Teams.