Upon being cross pollinated the two alleles for the

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Upon being cross-pollinated, the two alleles for the same trait segregated at gamete formation, thus resulting in a different genotype from both parents; however the same phenotype as the P1 parent which had dominant alleles. When self-pollinating the heterozygous F1 generation, we expected the dominant alleles would be expressed in the Phenotype Purple stem/ Green leaves Purple stem/Yellow leaves Green stem/ Green leaves Green stem/ Yellow leaves Ratio 9 3 3 1 My Results 7 4 2 0 Class Results 75 18 36 8
phenotype. Our results show exactly that, the dominant allele for stem color was purple and the dominant allele for leaf color was green. When self-pollinating the heterozygous F1 generation, to produce the F2 generation, we expected the phenotypic ratio to be 9:3:3:1. The acquired results and the Punnett square proved our hypothesis to be accurate. The ratio of the purple stem to the green stem is indicated in the F2 generation with a ratio of 3:1. Also, the same 3:1 ratio is recognized when comparing green leaves and yellow-green leaves. When the heterozygous F1 generations were self pollinated, the Law of Independent Assortment can be taken into account This can be seen by the reappearance of the recessive phenotype that was absent in the F1 generation but present in the F2 generations. Even though our results were as expected and supported our hypothesis, there were much potential for an error to occur. For example, maybe the plant didn’t receive enough water or sunlight, and therefore this might affect the gene expression. Another mistake was counting the phenotypes for our class results. Some students may have miscounted which caused our ratio to be obscured and off.
References Biology Laboratory Manual , Fall 2014. York College: Biology Department. Campbell, Neil A., and Jane B. Reece. (2011). Campbell Biology. (9 th edition) pp. 262- 285. San Francisco,CA: Benjamin Cummings. "Investigating Mendelian Genetics with Wisconsin Fast Plants™." Fall 2014. Biology Department. Print.

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