Wrinkled Beans Essay

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Biology Lab Report Lab No. 18: Biochemical Genetics: Investigating biochemical reactions in smooth peas and wrinkled peas Results: The presence of starch in smooth and wrinkled peas Phenotype of peas Genotype of peas Color (when iodine is added) Starch present Smooth SS or Ss (dominant) Dark blue-Black Yes Wrinkled ss (recessive) Brown No Conclusion The phenotype of the peas depends in its biochemical composition, which depends on all the biochemical reactions that take place. In turn, these reactions are controlled by enzymes and whether these enzymes are present depends on whether the genotype for their production was inherited. Therefore, in the end, whether particular enzyme(s) are present will determine the phenotype of the individual. The phenotype of the peas was also different (smooth, wrinkled), meaning that the biochemical reactions that take place in the peas are different to one another. We know that the presence of the enzyme phosphorylase has something to do with it. According to our results, starch is present in the smooth peas (we know this because of the dark blue-black strain of by the iodine after we added it to powdered smooth peas), therefore we can say that phosphorylase is present in the smooth peas and not (or very little) in the wrinkled peas (because the color of the iodine/Lugol solution did not change color). The reason as to why peas are wrinkled or smooth is rather complicated. The molecular basis of the smooth (alleles: SS or Ss) and wrinkled (alleles: ss) pea seeds involves the gene that codes for the enzyme phosphorylase. Peas that inherited the genotype “ss” (wrinkled peas) have an inactive form of the enzyme. Peas that are Ss have smaller amounts of the enzyme than SS seeds (not necessarily true because it is

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