Question

Question 20 This pedigree (Pedigree #1) illustrates the inheritance of a simple Mendelian disorder. What is the likely mode of inheritance A autosomal dominant B. autosomal recessive C. cannot be determined from the information given D. (This is not a choice.) A Moving to another question will save this response.

Answer 1

In the given pedigree, Both parents are affected and the chance of having affected offspring is 50%

In autosomal dominant inheritance, if both parents are affected then the chance of having affected offspring is 75%.

Hence, the mode of inheritance is not autosomal dominant

In autosomal recessive inheritance, if both parents are affected  then there is no chance of having unaffected offspring, All offsprings will be affected

Hence, the mode of inheritance is not autosomal recessive

Therefore, the answer is option D