Sigma Virus Infection in Drosophila Melanogaster Causes Flies to Become

question 38

Multiple Choice

Sigma virus infection in Drosophila melanogaster causes flies to become paralyzed and then die in high concentrations of CO₂. The virus is passed on extrachromosomally. Two isogenic strains
Of Drosophila cultures are maintained: R (resistant to CO₂ or wild type) and S (susceptible to CO₂, infected with sigma) . After crosses between male R and female S flies, subsets of offspring of each gender are tested for CO₂ sensitivity. Which of the following results do you expect?

• A)All the offspring are sensitive.
• B)All the offspring are female.
• C)All the offspring are male.
• D)All the offspring are sensitive, but only males pass it on.
• E)Only male offspring backcrossed to the female parent are sensitive.

---

Definitions:

Middle-Income Households

Families or households with income levels that fall in the middle of the national income distribution, typically encompassing those who can afford a comfortable lifestyle without being considered wealthy.

Currency Fluctuation

The variation in the exchange rate of one currency against another, affecting international trade, investment, and economics.

Value Fluctuation

Variations in the market value of goods, services, or assets over a period of time.

Currency Exchange

The process of converting one currency into another currency, typically involving different country's monetary units.