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.

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Jarrod RobelLv2

1 Jun 2019

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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.

goldmoose166

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

1. A true breeding tall pea line is crossed with atrue breeding short line. The F1 plants are all short. The F1 arecrossed with themselves to produce an F2. If the difference (tallvs. short) is due to a single locus, what proportion of the F2individuals do you expect to be tall?

2. Imagine that a researcher crossed the peas in theexample above, and counted 100 F2. 86 were short. 14 were tall. Doa chisquare test to see whether the results conform to a singlelocus cross with the allele coding for short plants dominant to theallele coding for tall plants.

3. A clematis from a true-breeding line with whiteflowers and short corollas (line A) is crossed to a clematis from atrue-breeding line with deep red flowers and long corollas (lineB). The resulting offspring, the F1, are all pink-flowered, withcorollas of medium length. An individual from the F1 iscrossed to an individual from line A. The resulting F2 offspringare as follows: 25% white flowers and short corollas, 25% whiteflowers with medium corollas, 25% pink flowers with short corollas,25% pink flowers with medium corollas.
What is the most likely genetic mechanism determining flower colorand corolla length? If a plant from the F1 listed above were selfed(crossed with itself), what proportion of the F2 offspring wouldyou expect to be white flowered with short corollas?

4. A man and a woman walk into a genetic counselorâsoffice. They have just had a child diagnosed with situs inversus, acomplete transposition of the internal organs from left to right,and vice versus. This condition usually produces no obvioussymptoms. It is caused by an autosomal recessive allele. What isthe chance that their next child will have the same condition? Whatmight this suggest about the parents?
Another man and woman walk into the same office. The father is anachondroplasic dwarf. The mother is of normal stature. (Look upachondroplasia, it is a lethal dominant). What is the chance thattheir first child will be a dwarf?

Please show work! (: