Which of the following best describes the below-mentioned pedigree?

• A. The pedigree shows the inheritance of an illness in three successive generations.
• B. In the pedigree, two individuals, II-1 and II-4, are affected.
• C. The pedigree shows the inheritance of a Y-linked trait.
• D. The pedigree shows the inheritance as an autosomal dominant trait.

Answer: (B)