8.Plant breeders developed two different pure-breeding plant linesthat gave no leaves. Each plant was crossed with normal (leafy)pure-bred plants to generate the following phenotypic ratios:

Cross F1 phenotype F2 phenptype

Line 1 x leafy all leaves 3:1 leaves: no leaves

Line 2 x leafy all no leaves 3:1 no leaves: leaves

Line 3 x line 2 all no leaves 13:1 no leaves: leaves

What's going on here? Why do two apparently similar plant linesproduce such different results? For each cross depicted in thetable, show the genotypes of all parental, F1, and F2 plants. Youwill show the results of a total of three crosses.

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Each plant was crossed with normal (leafy) pure-bredplants to generate the following phenotypic ratios:

F1phenotype F2 phenotype

Line 1 xleafy allleves 3:1 leaves, no leaves

Line 2 xleafy all noleaves 3:1 no leaves, leaves

Line 1 X line2 all noleaves 13:3no leaves, leaves

Why do two apparently similar plant lines produce suchdifferent results? For each cross depicted in the table, show thegenotypes of all parental, F1, and F2 plants. Show the results of atotal of three crosses.

1) The seed color in a species of flowering plant can be either green or white, with the trait determined by two independently assorting loci. At one locus, the G allele produces green color and is dominant to the recessive g allele for white. At the other locus the dominant, C, allele code for color production and its recessive counterpart, c, codes for colorless or white seeds. A pure-breeding green seeded plant is crossed with a white-seeded plant homozygous for both loci.

a) Identify all possible genotype(s) for the white-seeded parent and the F1 genotype(s) that each would produce when crossed with the true-breeding green seeded plant.

b) Assume that the genotype of the original white-seeded parent is gg, cc, F1 plants from the cross described in a. are crossed to produce the F2. Identify the F2 phenotypes and their expected ratio.

c) What would be the probability of producing a white-seeded plant in a cross between two F2 plants of the genotypes Ggcc and ggCc.

2) A snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals with no spots, and all the F1 had white petals. The F1 was selfed and among the F2 three phenotypes were obtained in the following numbers: white 240 purple no spots 61 purple with white spots 19 total 320

a) Propose and justify an explanation for these results, showing genotypes for all generations. Make up your own symbols

b) Calculate the chi square value for the data and decide on your hypothesis. Use the chi-square table provided in probability module

Dr. Richard C. Hall, a farmer in North Carolina, is growing hiscropof collard greens. He has a new variety that he callscollard red.He does some crosses of pure breeding blue topure breeding redcollards. The F1 was all green. Whenhe did a self cross of the F1,he got 9 green, 3 blue, and 4red.

1. (M T/F) The genes show dominant epistasis.

2. (MC) If Dr. Richard picked one of the F2 red, he couldbesure:
a. it is homozygous for both genes.
b. it is pure breedingforred.
c. it has the same genotype as theParentalred.
d. all the above
e. a and b

3. (MC) If Dr. Richard took at random a F2 blue plant and crosseditwith a pure breeding green plant, Dr. Richard would get:
a. all blue
b. a mixture of green and blue
c. a mixture of green, blue, and red
d. all green
e. cannot be determined from data given

4. (MC) If Dr. Richard crossed an F2 Blue plant with theparentalred plant, what are the chances he would get all greenplants?
a. 1 in 3
b. 2 in 3
c. all would be green
d. none of the above
e. cannot be determined from data given.

5. Determine the genotypes of the parental and F1 progeny. Dothe F2branch for phenotype groups.

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