A Drosophila has XXXXYY sex chromosomes. All the autosomal chromosomes are normal .
The sexual phenotype will be

Options

A. Normal female
B. super female
C. Intersexual
D. Male

Answer

To determine the sexual phenotype of a Drosophila with the sex chromosomes XXXXYY, we can follow these steps:

### Step 1: Understand the Genic Balance Theory
The genic balance theory states that the sex of Drosophila is determined by the ratio of X chromosomes to the number of sets of autosomes (A).

### Step 2: Identify the Number of X and Autosomes
In this case, the Drosophila has:
- 4 X chromosomes (XXXX)
- 2 Y chromosomes (YY)
- All autosomal chromosomes are normal.

Assuming Drosophila has 2 sets of autosomes (2A), we can proceed to calculate the ratio.

### Step 3: Calculate the Ratio of X Chromosomes to Autosomes
The ratio is calculated as follows:
- Number of X chromosomes = 4
- Number of sets of autosomes = 2 (since Drosophila typically has 2 sets of autosomes)

Thus, the ratio of X chromosomes to autosomes is:
\[ \text{Ratio} = \frac{\text{Number of X chromosomes}}{\text{Number of sets of autosomes}} = \frac{4}{2} = 2 \]

### Step 4: Determine the Sexual Phenotype Based on the Ratio
According to the genic balance theory:
- If the ratio is 0.5 (1X:2A), the phenotype is male.
- If the ratio is 1 (2X:2A), the phenotype is female.
- If the ratio is 2 (4X:2A), the phenotype is super female.

Since we calculated a ratio of 2, the sexual phenotype of the Drosophila with sex chromosomes XXXXYY is a **super female**.

### Final Answer
The sexual phenotype will be **super female**.

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