Concept explainers
To determine: The result obtained by cross-pollinating two different F1 plants.
Introduction: GregorMendel is known as the father of genetic because he proposed three laws of inheritance, and based on these laws,he developed pure lines and counted the results and kept the statistical notes. Mendel took seven characteristics of the pea plant and performed various type of crosses, using pea as a model
Explanation of Solution
When Mendel self crossed the yellow seeded pea plant, he observed that the yellow seeds and green seeds are produced in the ratio of 3:1, whereas when he crossed the yellow seeded plant with green seeded plant, the plant produces yellow and green seeds in the ratio of 1:1. When the plants are cross-pollinated, the F2 results will not be the same because F1 yellow is heterozygous, while green is homozygous genotypes.
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Chapter 2 Solutions
Introduction to Genetic Analysis
- You self an F1 plant that is heterozygous for two dominant resistance genes, R1 and R2 and inoculate the F2 progeny with a pathogen race that is avirulent on both R1 and R2 (it carries both avirulence genes Avr1 and Avr2).You get 40 susceptible progeny out of 200 total progeny. (a) What is the linkage phase for these two genes? (b) What is the recombination distance?arrow_forwardWhy is it impossible to cross a green and an albino plant?arrow_forwardIn Figure 3-21, what would be the leaf types of progenyof the apical (top) flower?arrow_forward
- GgTt pea plants can produce _____ type(s) of gamete(s), but a ggtt plant can produce _____ type(s) of gamete(s). explainarrow_forwardSuppose that a compound attractive to pollinators is produced by a plant in a pathway encoded by genes one (O) and two (T). You have obtained two pure lines of plants, one that produces the compound and one that does not (OOTT and oott, respectively). You cross them to obtain F1 plants that are heterozygous at both loci. (a) Use a branch diagram to visualize the possible outcomes of a cross between two F1 plants. (b) Calculate the expected proportion of offspring that will produce the attractant if this is a case of duplicate recessive epistasis. (c) What is the expected proportion of offspring that will produce attractant if this is a case of duplicate dominance?arrow_forwardif a plant is an auto-tetraploid with the genotype A1A1A2A2, what is the frequenct of offspring with the genotype A1A1A1A1 following self-fertilization of the plantarrow_forward
- In tomatoes, the red fruit color is completely dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow and the progeny are allowed to self pollinate. What phenotypes do you predict in the F2 generation? a) 3 red: 1 yellow b) 9 red : 3 orange : 1 yellow c) 1 red : 2 orange : 1 yellow d) 1 red : 1 yellowarrow_forwardA snapdragon with pink petals, black anthers, and longstems was allowed to self-fertilize. From the resultingseeds, 650 adult plants were obtained. The phenotypesof these offspring are listed here.78 red long tan26 red short tan44 red long black15 red short black39 pink long tan13 pink short tan204 pink long black68 pink short black5 white long tan2 white short tan117 white long black39 white short blacka. Using P for one allele and p for the other, indicatehow flower color is inherited.b. What numbers of red : pink : white would havebeen expected among these 650 plants?c. How are anther color and stem length inherited?d. What was the genotype of the original plant?e. Do any of the three genes show independentassortment?f. For any genes that are linked, indicate the arrangements of the alleles on the homologous chromosomes in the original snapdragon, and estimate thedistance between the genesarrow_forwardA horticulturist runs a test cross with an offspring (F1 generation) purple plant from Question 8. The phenotypic frequencies of the resulting offspring are 50% white and 50% purple. What is the true genotype of this offspring (F1 generation) purple plant?arrow_forward
- Flower color in petunias is determined by the biochemical pathway shown below: A_ B_ C_ Yellow Orange > Green Blue aa bb Plants of genotype AAbbcc were mated to plants of genotype AaBbCc. Determine the phenotypic ratio expected from this cross and fill in the spaces in the ratio below with whole numbers in lowest form. lf none are expected in a class, then type the number 0 in the space. Yellow: Orange : Green: Bluearrow_forwardRound (R) seed shape is dominant to wrinkled (r) seed shape in pea plants. If an RR plant is crossed with an rr plant, what is the frequency of phenotypes in the F2 generation? 1)1/4 RR, 1/2 Rr, 1/4 rr 2) All round seeds 3) 3 roundseeds, 1 wrinkled seed 4) All wrinkled seedsarrow_forwardIf an incompletely dominant red-flowered plant is crossed with an incompletely dominant white-flowered plant, what are the genotypes and phenotypes of the plant F1 generation? What genotypes and phenotypes will be produced in the F2 generation?arrow_forward
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