**Core Concept:** Autosomal Dominant Genetic Disorders

Autosomal dominant disorders are genetic conditions where the affected individual has one copy of the mutated gene from either parent. In this case, the disease affects females more than males. Since males only have one X chromosome (XXY), they usually only need one mutated gene to be affected, while females require two mutated genes (XYXX or XXY).

**Why the Correct Answer is Right:**

In autosomal dominant disorders, the chance of having the disease in the offspring depends on the sex of the parent carrying the mutated gene. If the parent is a male (XY), the child has a 50% chance of inheriting the disease. If the parent is a female (XX), the child has a 50% chance of inheriting the disease and a 50% chance of inheriting the normal gene and being a carrier.

**Why Each Wrong Option is Incorrect:**

A. This option does not consider the sex of the parent carrying the mutated gene.
B. This option incorrectly assumes a different inheritance pattern or gene expression.
C. This option does not address the sex-specific inheritance of autosomal dominant disorders.
D. This option does not explain the chance calculation based on the parent's sex.

**Clinical Pearl:**

Understanding sex-specific inheritance patterns is crucial in genetic counseling and predicting disease risk in offspring. Autosomal dominant disorders pose particular challenges for males, as they can be affected or carriers with only one mutated gene. This understanding helps healthcare providers tailor their advice to parents based on their sex and the sex of their offspring.

**Correct Answer:**

The correct answer is D - In an autosomal dominant disorder, if the carrier parent is female (XX), the child has a 50% chance of inheriting the disease and a 50% chance of inheriting the normal gene and becoming a carrier. If the carrier parent is male (XY), the child has a 50% chance of inheriting the disease and a 50% chance of inheriting the normal gene and becoming a carrier.

Answer: D - In an autosomal dominant disorder, if the carrier parent is female (XX), the child has a 50% chance of inheriting the disease and a 50% chance of inheriting the normal gene and becoming a carrier. If the carrier parent is male (XY), the child has a 50% chance of inheriting the disease and a 50% chance of inheriting the normal gene and becoming a carrier.