Select the correct statement?

Options

A. Sex-linked traits appear more frequently in females
B. Colour blindness is caused due to proper formation of colour sensitive cells
C. Human femals have a double dose of the X chromosome
D. Drone bees produce sperms by meiosis

Answer

To solve the question "Select the correct statement," we need to analyze each option provided:

### Step 1: Analyze Option A
**Statement:** A sex-linked trait appears more frequently in the female.

**Explanation:** Sex-linked traits are typically associated with the X or Y chromosomes. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). If a trait is recessive and located on the X chromosome, it is more likely to manifest in males because they have only one X chromosome. Therefore, this statement is incorrect.

**Hint:** Remember that males are more likely to express recessive traits linked to the X chromosome due to having only one copy.

### Step 2: Analyze Option B
**Statement:** Color blindness is caused due to the proper formation of color-sensitive cells.

**Explanation:** Color blindness is actually caused by the improper functioning of color-sensitive cells (cones) in the retina, not their proper formation. Therefore, this statement is also incorrect.

**Hint:** Focus on the function of the cells rather than their formation when considering conditions like color blindness.

### Step 3: Analyze Option C
**Statement:** Human females have a double dose of the X chromosome.

**Explanation:** This statement is correct. Females have two X chromosomes (XX), which gives them a "double dose" of the genes located on the X chromosome compared to males, who have one X and one Y chromosome (XY).

**Hint:** Remember the basic genetic makeup of males and females to determine the validity of statements about sex chromosomes.

### Step 4: Analyze Option D
**Statement:** Drone bees produce sperm by meiosis.

**Explanation:** Drone bees are haploid and produce sperm through mitosis, not meiosis. Therefore, this statement is incorrect.

**Hint:** Recall the difference between haploid and diploid organisms when considering reproductive processes.

### Conclusion
The correct statement is **Option C: Human females have a double dose of the X chromosome.**