n corn, purple kernels (P) are dominant over yellow kernels (p) and round kernels (R) are dominant to wrinkled kernels (r).   In a cross of PpRr (purple, round) with a PpRr (purple, round) plant, the following progeny were observed:   Phenotype Observed Expected (O-E) (O-E)2/E Purple, Round 288       Yellow, Round 90       Purple, Wrinkled 95       Yellow, Wrinkled 27         Total=500       a.  What is the expected ratio for PpRr X PpRr plant?  You can use a punnett square to find the expected ratio.  Fill out the expected values in the chart above and calculate the Chi-Square value for your table, look up the p value associated with the Chi-Square.    b.  How many degrees of freedom do you have in this cross?  c.  What is your Chi-Square value?  d.  What is the p value for this cross

In kangaroos, pouched kangaroos (P) are dominant over pouchless kangaroos (p) and bushy tails (B) are dominant over skinny tails (b). You perform the following cross and observe the progeny. PPBb x Ppbb To determine if the difference between the observed and expected results are due to change, you perform a chi-squared analysis. What degree of freedom would you use for this analysis? 0 20000 2 AWN 3 4

O All three genes are linked, but need to do more crosses and data to determine the gene order. All three genes are linked with the flower color gene (F) in the middle. All three genes are linked with the seed weight gene (S) in the middle. All three genes are linked with the leaf size gene (L) in the middle.

A cross was performed using Drosophila melanogaster involving a female known to be heterozygous for both ebony body and sepia eyes and a male known to be homozygous wild type male. The resulting progeny were allowed to mate with one another to produce the data set. Three repetitions of the experiment were conducted. The following data were produced from the crosses. Test these data to determine if they are significantly different from the expected phenotypic ratio. Use the 5% level of significance.  Your answer should include the hypothesized cross in genotypes, the Chi-squared value, the critical value and whether you reject or do not reject for each experiment. Wild eye Wild body – 112, Wild eye Ebony body – 40, Sepia eye Wild body – 35, Sepia eye Ebony body – 11

In sunflowers, two plants heterozygous for mutant (recessive) alleles b and e are crossed. For each parent, recessive alleles b and e are in the trans configuration and 10.2 centiMorgans apart. If these plants are crossed, what percentage of progeny will be double mutants (be/be)

In garden pea, resistance to a certain disease is controlled by a single locus with dominance forresistance (R) and recessive susceptible (r). Another locus governs seed color with yellow being dominant (Y)to green (y). A pea plant which is heterozygous for both gene pairs is crossed with a susceptible and green-seeded plant. The following data was observed in the progeny. Phenotype                                NumberResistant yellow                           43Susceptible green                         49Resistant green                             16Susceptible yellow                         12Total                                               120 a. What is the calculated chi-square value based on an independent assortment assumption? Compute forthe df and write the conclusion. (NOTE: The cross will not yield a 9:3:3:1 ratio since not both of theparental genotypes are heterozygous for the 2 pairs of alleles. Thus, perform the cross first, show theparental genotypes, the gamete…