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3) Breed E averages 45 lbs, breed F averages 80 lbs, and the F1 averages 75 lbs. Calculate the amount of hybrid vigor.
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- 1) Calculate the percent heterosis for a trait where breed A averages 100 lbs, breed B averages 150 lbs, and the F1 averages 140 lbs. Calculate the percent heterosis.2) Breed C averages 230 lbs, breed D averages 150 lbs, and the percent heterosis is 8%. Calculate the average phenotype of the F1From an agricultural point of view, discuss the advantages and disadvantagesof selective breeding. It is common for plant breeders to take two different, highly inbred strains, which are the product of many generations of selective breeding, and cross them to make hybrids. How does this approach overcome some of the disadvantages of selective breeding?
- A. Part 1: F1 Generation Yellow Sampaguita- Homozygous recessive (cc) White Sampaguita- Homozygous dominant (CC) a. With the given sampaguita flowers, you will be crossing these two samples and identify the offspring using a punnet square. Indicate the ratio between each offspring B. Part 2: F2 generation a. With the results you have from Part 1 and using a punnet square, what are the offspring of your heterozygous parents to identify the F2 generation. Indicate the ratio between each offspring. Note: Please provide the punnet square and a detailed explanationA dark-red strain and a white strain of wheat are crossed and produce an intermediate, medium-red F1. When the F1 plants are interbred, an F2 generation is produced in a ratio of 1 dark-red: 4 medium-darkred: 6 medium-red: 4 light-red: 1 white. Further crosses reveal that the dark-red and white F2 plants are true breeding. (a) Based on the ratios in the F2 population, how many genes are involved in the production of color? (b) How many additive alleles are needed to produce each possible phenotype? (c) Assign symbols to these alleles, and list possible genotypes that give rise to the medium-red and light-red phenotypes. (d) Predict the outcome of the F1 and F2 generations in a cross between a true-breeding medium-red plant and a white plantAn inbred strain of plants has a mean height of 24 cm. A second strain of the same species from a different geographic region also has a mean height of 24 cm. When plants from the two strains are crossed together, the F1 plants are the same height as the parent plants. However, the F2 generation shows a wide range of heights; the majority are like the P1 and F1 plants, but approximately 4 of 1000 are only 12 cm high and about 4 of 1000 are 36 cm high. (a) What mode of inheritance is occurring here? (b) How many gene pairs are involved? (c) How much does each gene contribute to plant height? (d) Indicate one possible set of genotypes for the original P1 parents and the F1 plants that could account for these results. (e) Indicate three possible genotypes that could account for F2 plants that are 18 cm high and three that account for F2 plants that are 33 cm high.
- Hibiscus plants have different varieties of flowers. In an instance, both the red and white flowers showed that they are incompletely dominant with each other. What is the percentage of the flowers' phenotype that was produced in the Hibiscus experiment? Explain. A) 125% B) 75% C) 100% D) 50%If there is a maximum Lod score of 4.2 at θ = 0.31, what can you say about the linkage and the distance between two genes?Show the cross between a pure breeding dominant tall pea plant and a short plant in a punnet square
- A strain of plants has a mean height of 24 cm. A second strain ofthe same species from a different geographical region also has a mean height of 24 cm. When plants from the two strains arecrossed together, the F1 plants are the same height as the parentplants. However, the F2 generation shows a wide range ofheights; the majority are like the P1 and F1 plants, but approximately4 of 1000 are only 12 cm high, and about 4 of 1000 are36 cm high. Question: What mode of inheritance is occurring here?Cross 1: Purple Stem (P1) x Brown Stem (P2) = F1 Generation (all purple stem plants). Cross 2: F1 x F1 = F2 Generation (295 purple stem plants and 102 brown stem plants). a) What is the phenotype ratio of the F2 generation? b) What is the geneotype ratio of the F2 generation? c) Which trait is dominant?What is the genotype of pure - breed round seeds ?. a .Rryy b . Rr c. Rrry d. RR