terms of a chi-square analysis, what ratio would be tested for the offspring of a monohybrid cross involving a pure-breeding dominant condition mated with a pure-breeding recessive condition?
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In terms of a chi-square analysis, what ratio would be tested for the offspring of a monohybrid cross involving a pure-breeding dominant condition mated with a pure-breeding recessive condition?
The Chi-Square test is a statistical test used to infer how closely the observed data suits the expected data by calculating the difference between the observed value and expected value.
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- In a dihybrid cross, if two heterozygous individuals for both genes are crossed, what will be the expected phenotypic ratios? (In the following order: dominant for both traits; dominant for the first trait recessive for the second; recessive for the first trait and dominant for the second; recessive for both traits) show your solution using punnet squareComplete a Punnett square for a genetic cross of two truebreeding Portuguese water dogs—one with a black, wavy coat (homozygous dominant, BBWW) and one with a brown, curly coat (homozygous recessive, bbww). What is the phenotype ratio of their offspring (F1)? Now fill out another Punnett square, crossing two of the offspring. What is the phenotype ratio of the F2 generation?On the basis of Mendel’s observations (i.e. Mendelian patterns), predict the results from the following crosses with peas. Show the results in terms of genotypes, phenotypes, and their proportions in the offspring. The progeny of a tall (dominant and homozygous) variety crossed with a dwarf variety. The progeny of (a) self-fertilized. The progeny from (a) crossed with the original tall parent. The progeny of (a) crossed with the original dwarf parent.
- Dihybrid crosses which involve genes that are linked to each other usually give unexpected results (i.e., the ratio of phenotypes observed among the offspring does not correspond to 9:3:3:1) due to the fact that the genes involved do not follow: 1) the second law of thermodynamics 2) Mendel's law of independent assortment 3) Mendel's law of segregation 4) the assumption that the eggs and sperm combine randomly to produce zygotes O 5) the first law of thermodynamicsA tall pea plant (homozygous dominant) is crossed to a pea plant that is heterozygous for the gene for height. Create a Punnett Square and use it to answer the following questions: What is the genotypic ratio of the offspring? What is the phenotypic ratio of the offspring? Answers are written as genotype; phenotype a) 50% TT : 50% Tt; 100% tall plants b) 1 TT : 2 Tt : 1tt; 75% tall plants : 25% dwarf plants c) 1 TT : 2 Tt : 1tt; 25% tall plants : 50% medium height plants : 25% dwarf plantsYou are working for a parakeet breeder that has some green birds and some blue birds. You want to determine which feather color is dominant. You cross a blue male to each of two green females. In the first cross, the blue male is crossed to a green female named Gabby, resulting in 2 green and 2 blue offspring. In the second cross, the same blue male is crossed to a green female named Gail, resulting in 5 green offspring. Based on these results: ● [Select] phenotype is dominant. • Gail's genotype is [Select] The cross between the male and Gabby is called a [ Select] cross.
- 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 problemIn a species of the cat family, eye color can be gray, blue, green, or brown, and each trait is true breeding. In separate crosses involving homozygous parents, the following data were obtained: Cross P1 F1 F2 A green * gray all green 3/4 green: 1/4 gray B green * brown all green 3/4 green: 1/4 brown C gray * brown all green 9/16 green: 3/16 brown 3/16 gray: 1/16 blue (a) Analyze the data. How many genes are involved? Define gene symbols and indicate which genotypes yield each phenotype. (b) In a cross between a gray-eyed cat and one of unknown genotype and phenotype, the F1 generation was not observed. However, the F2 resulted in the same F2 ratio as in cross C. Determine the genotypes and phenotypes of the unknown P1 and F1 cats.In a dihybrid cross of two bi-allelic Mendelian genes, A (two alleles – completely dominant A and recessive a), and B (two alleles – completely dominant B and recessive b), such that the parental generation comprises of pure-bred homozygotes (i.e. AABB with aabb), what are the expected genotype and phenotype ratios in the F1 and F2, if the F1 cross is (a) an intercross and if the F1 cross is (b) a testcross
- In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares do you need to do a Punnett square analysis of this cross?In roan cattle, red (R) and white (W) are codominant. Heterozygous individuals produce both red and white hairs, known as roan. When two roan cattle are crossed, what are the phenotypic ratios of the offspring?A true-breeding purple-leafed plant isolated from one side of El Yunque, the rain forest in Puerto Rico, was crossed to a truebreeding white variety found on the other side. The F1 offspring were all purple. A large number of F1 * F1 crosses produced the following results: purple: 4219 white: 5781 (Total = 10,000) Propose an explanation for the inheritance of leaf color. As a geneticist, how might you go about testing your hypothesis? Describe the genetic experiments that you would conduct