Two Varieties-X (Susceptible) and Y (Resistant)-Of Eggplant Were Used to Characterize

question 77

Essay

Two varieties-X (susceptible) and Y (resistant)-of eggplant were used to characterize the genetics of resistance to a necrotizing plant pathogen. Eight thousand plants from each variety were inoculated, and the average number of necrotic lesions produced per leaf was recorded. Variety X averaged 52 lesions per leaf, whereas variety Y averaged six lesions per leaf. The F₁ progeny from a cross between variety X and variety Y plants averaged 21 lesions per leaf, with a standard deviation of 3.7. Of the F₂ progeny, 8000 were again tested by inoculation, and a total of four plants produced were phenotypically similar to the original parental plants-two plants for each extreme (i.e., parental) phenotype. Overall, the F₂ plants averaged 18 lesions per leaf with a standard deviation of 7.5.
a. How many gene pairs control resistance to this pathogen?
b. Determine the broad-sense heritability of resistance to this particular pathogen among the F₂ plants, assuming that there is no genetic-environmental interaction variance for this trait.

---

Definitions:

Managing Diversity

The practice of acknowledging, understanding, accepting, and valuing differences among people with respect to age, class, ethnicity, gender, physical and mental ability, race, sexual orientation, spiritual practice, and public assistance status in the workplace.

Organization Mosaic

An organizational structure metaphor that emphasizes the diverse and unique pieces (e.g., employees, departments) coming together to create a cohesive and functional whole.

Human Rights Legislation

Legislation that protects individuals from discrimination based on various grounds such as race, gender, disability, and religion.

Federal And Provincial Laws

The body of law that is legislated by both national (federal) and regional (provincial or state) governments, governing various aspects of life and business.