Corn Genetics #Genetricks #WongSwag
Devansh Taori
Biology AP
Period 2
Mr. Wong
Conclusion
In this experiment, we analyzed two types of crosses within corn plants – monohybrid and dihybrid crosses. In monohybrid crosses, the parent plants differ with respect to only one trait. However, for dihybrid crosses, the parent plants differ with respect to two traits.
In the monohybrid cross, the probable parent genotypes for color were Pp and for texture were Ss. According to probability theory, the expected % of dominant to recessive traits was 75% to 25%. We indeed did find this when looking at our results – 173 were purple (dominant), and the other 64 were yellow (recessive) – that's 73% to 27%. 184 were smooth (dominant), and the other 53 were shrunken (recessive) – that's 78% to 22%. Thus, looking at results, it's clear to see that in the monohybrid cross, the offspring displayed their traits in accordance with standard Punnett Square probability theory.
In the dihybrid cross, however, the optimal ratio was 9 purple and smooth : 3 purple and shrunken : 3 yellow and smooth : 1 yellow and shrunken, according to the Punnett Square above. We actually did find this with our results – approximately 136 were purple and smooth, 37 were purple and shrunken, 48 were yellow and smooth, and 16 were yellow and shrunken. That's very close to the 9:3:3:1 ratio predicted, which once again, proves the hypothesis that the Punnett Square predicted. Since the df was 3, and the chi-square value was 1.609, the table above shows there's a good fit for the ear and data. This means that the observed results were probably NOT due to chance, and thus the null hypothesis is true.
Ultimately, this experiment was super fun to conduct. If we were to do it again, we would've tried using many more corn kernels (to correct statistical error). We could've also tested other traits within the corn plants themselves.
Special shout-out to Mr. Wong for letting us do this experiment. As always, he's a legend.
#WongDog #YouTheBest #BioIsTheBest
Biology AP
Period 2
Mr. Wong
Conclusion
In this experiment, we analyzed two types of crosses within corn plants – monohybrid and dihybrid crosses. In monohybrid crosses, the parent plants differ with respect to only one trait. However, for dihybrid crosses, the parent plants differ with respect to two traits.
In the monohybrid cross, the probable parent genotypes for color were Pp and for texture were Ss. According to probability theory, the expected % of dominant to recessive traits was 75% to 25%. We indeed did find this when looking at our results – 173 were purple (dominant), and the other 64 were yellow (recessive) – that's 73% to 27%. 184 were smooth (dominant), and the other 53 were shrunken (recessive) – that's 78% to 22%. Thus, looking at results, it's clear to see that in the monohybrid cross, the offspring displayed their traits in accordance with standard Punnett Square probability theory.
In the dihybrid cross, however, the optimal ratio was 9 purple and smooth : 3 purple and shrunken : 3 yellow and smooth : 1 yellow and shrunken, according to the Punnett Square above. We actually did find this with our results – approximately 136 were purple and smooth, 37 were purple and shrunken, 48 were yellow and smooth, and 16 were yellow and shrunken. That's very close to the 9:3:3:1 ratio predicted, which once again, proves the hypothesis that the Punnett Square predicted. Since the df was 3, and the chi-square value was 1.609, the table above shows there's a good fit for the ear and data. This means that the observed results were probably NOT due to chance, and thus the null hypothesis is true.
Ultimately, this experiment was super fun to conduct. If we were to do it again, we would've tried using many more corn kernels (to correct statistical error). We could've also tested other traits within the corn plants themselves.
Special shout-out to Mr. Wong for letting us do this experiment. As always, he's a legend.
#WongDog #YouTheBest #BioIsTheBest
Comments
Post a Comment