From a presumed testcross of 2 plants of genotype Aa x aa (in which A represents red and a represents white petals on a plant) we get 5000 red petal plants, and 5400 white petals plants. Using the Chi-squared test, what chi-squared value do we get for this?
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From a presumed testcross of 2 plants of genotype Aa x aa (in which A represents red and a represents white petals on a plant) we get 5000 red petal plants, and 5400 white petals plants.
Using the Chi-squared test, what chi-squared value do we get for this?
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- Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seedsFor many students, calculating the chi square value is the most challenging part of conducting a chi square test so it is important to practice. Consider the following information: An F1 tall, round seed pea plant is crossed with a dwarf, wrinkled seed pea plant. The following offspring are observed: Tall, round: 510 Tall, wrinkled: 495 Dwarf, round: 490 Dwarf, wrinkled: 505 a. What is the expected phenotype ratio? #:# or #:#:#:#, depending on what you think the answer is. b. What is the calculated chi-square value? Format your answer with 1 significant digit (i.e. 0.#). c. What is the critical chi-square value from the table provided in the book at the P=0.05 level of significance? Enter the number exactly as shown in this table.PBIKE GU IKE GU Assume that a cross is made between a heterozygous tall pea plant and a s short pea plant. Fifty ofte GOR ano 582 produced in the following frequency: 30 = tall, 20 = s a) What frequency of tall and short plants is expected? b) To test the goodness of fit between the observed and expected values, provide the needed statement of the null c) Compute a Chi-square value (Table value is equal to 3.84) associated with the appropriate test of significance. d) How many degrees of freedom are associated with this test of significance? 29056 290582
- A test cross between a plant of genotype PpSs and the tester white plant with wrinkled seed coat (ppss) gives the following numbers of progeny in four phenotypic types. 14:87:83:16 (purple flower + smooth seed coat: purple flower + wrinkled seed coat: white flower + smooth seed coat: white flower + wrinkled seed coat). a. What is the expected ratio of progeny phenotypes assuming independent assortment of alleles? b. Explain how ratios of progeny show that the two genes are linked. c. How many map units separate the purple and smooth genes? Show your calculations. d. What is the “parental” genotype of the heterozygous parent? (i.e. Which alleles of the P and S loci are present on each of the two chromosomes of the doubly heterozygous parent of this test cross?)pt pt PT PPTt purple tall PpTt purple tall Pt Pptt purple white Pptt purple white Using any two plants resulting from your test cross (even two of the same genotypes if you would prefer), perform a second cross. Provide a Punnett square demonstrating this dihybrid cross.What are the ratios for each genotype in the resulting offspring? What are the ratios for each phenotype? Your answer should clearly indicate the genotype and phenotype each portion of the ratio is referring toA corn plant with this genotype AABBCCDD is 72cm tall which is crossed with plant aabbccdd which is 24cm tall. All F1 averaged 48cm in height. (Each effective allele contributes 6cm to the base). How tall are these individuals? Indicate the contributing alleles for AaBbCcDd, aaBbccdd, AABbCcDD, aabbCcDd, AABbCcDd with solution.
- To assess Mendel’s law of segregation using tomatoes, a true-breeding tall variety (SS) is crossed with a true-breeding short variety (ss). The heterozygous F1 tall plants (Ss) were crossed to produce two sets of F2 data as follows. Set 1 Set 2 30 tall 300 tall 5 short 50 short Using the chi-square test, analyze the results for both datasets. Calculate the chi-square values and estimate the p-values in both cases. From the above analysis, what can you conclude about the importance of generating large datasets in experimental condition?In'a Mendelian monohybrid cross, the F2 generation consists of 1/4 red-flowered, 1/2 pink-flowered, 1/4 white-flowered individuals. What does this indicate? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). 14px A Ix BIUS Paragraph Arial ABC 田 三 x² X2 田用因 Ť {} +]What are the expected phenotypic ratios from the following cross:Tt Rr yy Aa × Tt rr YY Aa, where T = tall, t = dwarf, R = round,r = wrinkled, Y = yellow, y = green, A = axial, a = terminal; T, R,Y, and A are dominant alleles. Note: Consider using the multiplication method in answering this problem
- Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high. The F1 from (b) is then crossed to give an F2. What proportion would you expect in the F2 of each extreme phenotype?Two pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54 cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth conditions and that the alleles of the three genes are additive. If the F1 plants are self crossed, what is the expected proportion of F2 plants with the genotype A₁A₁B₁B₁C₁C₁ 1/8 1/32 1/16 1/4 1/64SEATWORK Symbols (for pea plant traits): • T: Tall t: short Analyze the following problems. Determine the possible genotypes, genotypic ratio, phenotypes, and phenotypic ratio from the genetic cross. Show your solution through a Punnett square. Use the symbols provided. • R: Round seeds r: wrinkled seeds • Y: Yellow seeds y: green seeds • P: Purple flower p: white flower 1) Cross a homozygous dominant tall and homozygous round seed pea plant with a heterozygous tall and heterozygous round seed pea plant. 2) Cross a pea plant that is heterozygous for purple flowers and homozygous dominant for yellow seeds with a pea plant that is heterozygous for purple flowers and homozygous recessive for green seeds. 3) Cross a pea plant that is short and has green seeds with a pea plant that is heterozygous tall and has heterozygous yellow seeds.