Drosophila with genotype AAA+XX is

Options

A. Normal male
B. Normal femal
C. intersex
D. Metamale.

Answer

To determine the sex of Drosophila with the genotype AAA+XX, we need to analyze the X:A ratio according to the genic balance theory. Here’s a step-by-step solution:

### Step 1: Identify the Genotype
The genotype given is AAA+XX. This means:
- There are 3 autosomes (A) represented by AAA.
- There are 2 X chromosomes (X) represented by XX.

### Step 2: Count the Number of X and A Chromosomes
From the genotype:
- Number of X chromosomes (X) = 2
- Number of A chromosomes (A) = 3

### Step 3: Calculate the X:A Ratio
The X:A ratio is calculated by dividing the number of X chromosomes by the number of A chromosomes:
\[ \text{X:A ratio} = \frac{\text{Number of X}}{\text{Number of A}} = \frac{2}{3} \approx 0.67 \]

### Step 4: Interpret the X:A Ratio
According to the genic balance theory:
- If the X:A ratio is 1, the individual is a normal female.
- If the X:A ratio is 0.5, the individual is a normal male.
- If the X:A ratio is between 0.5 and 1 (i.e., 0.5 < X:A < 1), the individual is classified as intersex.

Since our calculated ratio of approximately 0.67 falls between 0.5 and 1, we conclude that the Drosophila is intersex.

### Final Answer
Drosophila with the genotype AAA+XX is intersex.

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