**Category:** Genetics  
**Subtype:** Inheritance Patterns  
**Problem Description:** This problem involves analyzing a pedigree chart to understand the inheritance of two genetic diseases in humans. It requires determining the validity of several statements regarding the inheritance patterns, potential genotypes of individuals, and probabilities related to offspring of specific couples. 

**Key Points:**
- The pedigree shows individuals affected by two diseases.
- It is specified that there are no mutations and certain individuals have known genotypes.
- The task is to evaluate the truth of four statements based on the information provided in the pedigree.