23. In garden peas, tallness (T) is dominant to shortness (t) and axillary flowers (A) are dominant to terminal flowers (a). What are the expected genotypes and phenotypes of the offspring if a heterozygous tall, heterozygous axillary plant is crossed with a heterozygous tall, terminal plant? Give your answers in probabilities (%). a. What are the genotypes of the parents? b. Complete the dihybrid cross: C. What are the phenotype ratios?
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- Make sure to include (genotypic ratios) For part A) make sure to have table or the phenotypic or genotypic ratios 5. In garden peas, green pod (P) is dominant to yellow pod (p) and tall stemmed (T) plants are dominant to short stemmed plants (t). Please give the genotypic and phenotypic ratios from the following crosses. a) Homozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) short stemmed (homozygous) plant. b) Homozygous green pod homozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. c) Heterozygous green pod heterozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. d) Heterozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) homozygous tall stemmed plant. These are dihybrid crosses. 7. In pea plants, flower colour and pollen shape are located on the same chromosome. A plant with purple flowers and…. In nature, the plant Plectritis congesta is dimorphic forfruit shape; that is, individual plants bear either winglessor winged fruits, as shown in the illustration.Wingless fruit Winged fruitPlants were collected from nature before floweringand were crossed or selfed with the following results:Number of progenyPollination Winged WinglessWinged (selfed) 91 1*Winged (selfed) 90 30Wingless (selfed) 4* 80Winged × wingless 161 0Winged × wingless 29 31Winged × wingless 46 0Winged × winged 44 0*Phenotype probably has a nongenetic explanation.Interpret these results, and derive the mode ofinheritance of these fruit-shaped phenotypes. Usesymbols. What do you think is the nongeneticexplanation for the phenotypes marked by asterisks inthe table?6. In garden peas, round seeds ( R) are dominant over wrinkled (), yellow seeds ( Y) are dominant over green (y), purple flowers (A) are dominant over white (a) and tall plants (T) are dominant over short (t). Consider the following pea plants, and answer the questions below: Plant 1 = Rr Yy aa tt, Plant 2 = Rr Yy Aa Tt In a cross of Plant 1 x Plant 2, what proportion of progeny will: 6a. have the genotype Rr Yy aa tt? 6b. have the phenotype wrinkled, yellow seeds, white flowers, and short? 6c. have the dominant phenotype for all four characteristics? 6d. be pure breeding for seed shape?
- 31 A researcher observes that when two heterozygous plants with red flowers are crossed, the resulting offspring include plants with red, white, or pink flowers. The researcher proposes the null hypothesis that flower color is the result of independent assortment and incomplete dominance. The researcher calculates a 0/1 chi-square value of 7.3. Assuming two degrees of freedom, which of the following is the correct interpretation of the chi-square analysis, using a p-value of 0.05? The null hypothesis should be rejected because the critical value is less than the calculated value. The null hypothesis should not be rejected because the critical value is greater than the calculated value. The null hypothesis should be rejected because the critical value is greater than the calculated value. The null hypothesis should not be rejected because the critical value is less than the calculated value.2. 3 1. In radishes, flower color may be red, purple, or white. The edible portion of the radish may be long or oval. When only flower color is studied, no dominance is evident, and red x white crosses yield all purple. Determine the appropriate allele symbols and indicate which genotypes lead to which a. phenotypes. b. If the F1 purple plants described above are interbred, what will be the genotype and phenotype ratios in the F2 generation? C. Regarding radish shape, long is dominant to oval in the typical Mendelian fashion. What will be the phenotype ratios in the F2 generation of a cross between a true-breeding red, long radish and a white, oval radish?QUEJTIUIv 4 In tomato plants, tall vine (D) is dominant over dwarf vine (d) and round fruit (0) is dominant over oval-shaped fruit (o). Two tall, round-fruit shape plants (plants 1 and 2) are crossed with dwarf, oval-shape fruit plants. The results are as follows: PLANT 1 PLANT 2 Tall, round x dwarf, oval-shape Phenotypic classes Tall, round Dwarf, oval Tall, oval Dwarf, round Tall, round x dwarf, oval-shape Phenotypic classes Numbers Numbers 81 Tall, round 21 Dwarf, oval Tall, oval Dwarf, round 79 19 22 77 18 83 Total 200 Total 200 a. Why is there a difference in the proportionate number of plants in each phenotypic class of the offspring resulting from test crosses of plants 1 and 2? b. Calculate the recombination frequency between the genes D/d and O/o in tomatoes. c. Draw a chromosome map for these genes. (Use underscore (_) to draw the line for the map)
- 5. In garden peas, green pod (P) is dominant to yellow pod (p) and tall stemmed (T) plants are dominant to short stemmed plants (t). Please give the genotypic and phenotypic ratios from the following crosses. a) Homozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) short stemmed (homozygous) plant. b) Homozygous green pod homozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. c) Heterozygous green pod heterozygous tall stemmed plant crossed with a heterozygous green pod heterozygous tall stemmed plant. d) Heterozygous green pod homozygous tall stemmed plant crossed with a yellow pod (homozygous) homozygous tall stemmed plant. These are dihybrid crosses. 7. In pea plants, flower colour and pollen shape are located on the same chromosome. A plant with purple flowers and long pollen (AaBb) is crossed with one that is recessive for both traits (aabb). Calculate the…1. P is a dominant allele for purple flowers and p is the recessive allele that causes white flowers. The following cross is performed: Pp x pp. What percentage of offspring would you expect to have white flowers? 2. In peas, T (tall) is dominant to t (dwarf). A homozygous dominant plant is crossed to a heterozygous plant. What is the expected outcome for the genotype ratio of offspring from this cross? What percentage of offspring would you expect to be tall? 3. In peas, Y (yellow seeds) is dominant to y (green seeds) and R (round seeds) is dominant to r (wrinkled seeds). The following cross is performed: YYRr x yyrr. What is the expected phenotype ratio of the offspring?97 Assume that the trihybrid cross MM SS tt X mm ss TT is made in a plant species in which Mand S are dom- inant but there is no dominance between T and t. Consider the F2 progeny from this cross, and assume independent assortment. (a) How many phenotypic classes are expected? (b) What is the probability of genotype MM SS t? obib (c) What proportion would be expected to be 15 2nod bolleo homozygous for all genes? ablla Insninmobo.(om
- 1. The height of a wheat plant is determined by several genes. In a variety the minimum size is 12 inches and the maximum is 24 inches. 12-inch plants were crossed with 18-inch plants, and produced an 18-inch F1. The F1 was allowed to cross each other, and an F2 was obtained in which the 12 and 24 inch plants were obtained with a frequency of 2/8195. How many genes are involved in determining plant size in this variety of wheat? Select one: a. 5b. 6c. 4d. 3One Trait (Monohybrid) Crosses-Complete Dominance 1. In peas, inflated pod is dominant over wrinkled. If a homozygous inflated pod plant is crossed with a homozygous wrinkled pod plant, what will be the F₂ phenotypic ratio? 2. A tall pea plant crossed with a dwarf pea plant produces offspring of which about half are tall and half are dwarf. What are the genotypes of: a. the tall parent b. the dwarf parent 3. What does "test cross" or "backcross" mean?I. In an exotic Peruvian plant, burgundy flowers (B) are dominant to pink flowers (b), green stalks (G) are dominant to yellow (g) and hairy leaves (H) are dominant to smooth leaves (h). What is the probability that the following pair of parents will produce the indicated offspring? Parent 1 = BbGgHh x Parent 2 = BBGghh -> Offspring = BBgghh Punnett squares for each individual trait can help you with this: 000 Parent 1 Parent 2 Probability= (BB) What is the phenotype of BBgghh? Which of the following options are gametes that Parent 1 can produce? Circle the correct one(s). hh BGH Bgh Bb bGh BgH Gg bGH BbGghh (gg) X (hh)