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A variety of pure-breeding snapdragons produces a tall plant with green seeds (WWSS). A second variety of pure-breeding snapdragons produce a short plant with white seeds (wwss). The two varieties are crossed, and the resulting seeds are collected. All of the seeds are green and when planted, they produce all tall plants (WwSs). These tall F1 plants are allowed to self-fertilize. The results for seeds and plant height in the F2 generations are as follows. What is the ?2
value, and the degrees of freedom for this experiment?

F2 Plant phenotype

Observed #

Green seed, tall

588

White seed, tall

155

Green seed, short

162

White seed, short

95

Total

1000

?2 = 27.1, df = 1

?2 = 27.1, df = 3

?2 = 3.1, df = 3

?2 = 3.1, df = 4

?2 = 3.1, df = 1

?2 = 27.1, df = 4

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Bunny Greenfelder
Bunny GreenfelderLv2
28 Sep 2019

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Related questions

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.

1. Cross a homozygous purple Plant (PP) with a homozygous white plans (PP). This is called the P1 cross, and it will produce offspring called the F1 generation. You are given that purple color is dominant to white in this species.

a) What is the genotype of the purple plant?

b) What gametes can the purple plant make?

c) What is the genotype of the white plant?

d) What gametes can the white plant make?

e) Create a Punnett Square explaining this.

f) What is the genotypic Ratio?

g) What is the phenotypic ratio?

2. Cross a homozygous tall yellow seeded plant with a homozygous short green seeded plant. This is called the P1 cross, and it will produce offspring called the F1 generation. Tallness is dominant to shortness, so use a capital T to represent the tallness allele and lower case t to represent the shortness allele. Yellow seeds are dominant to green sees, so use a capital Y to represent the yellow seed allele and a lower case y to represent the green seed allele.

a) What is the genotype of the tall plant?

b) What gametes can the tall plant make?

c) What is the genotype of the short plant?

d) What gametes can the short plant make?

e) Create a punnett square explaining this

f) What is the genotypic ratio of the F1 plants?

g) What is the phenotypic ration of the F1 plants?

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

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