Write your answer to the following prompt within the space provided. Be sure to answer all parts. Prompt:
In the 1970’s, Benjamin Stacey was born with methemoglobinemia (rr). Neither of Benjamin’s parents were affected by the genetic condition and none of his three siblings showed signs of blue skin, lips, or nails. Since this condition is passed down by genetic traits, his mother was genetically tested and was determined to have a heterozygous genotype (Rr) for methemoglobinemia.

Part A: Determine the genotype for his father and possible genotypes for his three siblings. Provide a brief explanation of your reasoning.
Part B: If Benjamin Stacey were to marry and have children with a woman affected by methemoglobinemia, predict the probability of their children inheriting this condition. Provide a brief explanation of your reasoning.