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C-Fern Lab

C-Fern Lab

Inheritance of genes that code for the phenotypic color in Ceratopteris

Abstract
In this lab we took a green F1 diploid sporophyte population and allowed meiosis to occur to produce G2 haplolid gametophytes.  Of the two cultures, Hybrid A gametophytes were produced in equal numbers of both mutants, while Hybrid B produced significantly more pale.    These populations were allowed to fertilize randomly to produce a diploid F2 sporophyte population.  Because of this diploidization, I hypothesized that there would be many more green sporophytes than pale ones in Hybrid A, since green is dominant (Lab Manual 2.2).  I made this assumption believing that Hybrid A would follow the expected Mendelian ratio of a monohybrid cross, which is 3:1 (Klug & Cummings 46).  The results obtained for Hybrid A held true to this hypothesis.  Hybrid B followed a different pattern of inheritance (Lab Manual 2.2).  After I obtained the class results for the F1 and F2 populations I hypothesized that the pattern of inheritance for Hybrid B was due to epistasis of one of the alleles in a dihybrid cross.  The results of Hybrid B held true to the Mendelian ratio for dihybrid crosses,

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Word Count: 1398

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