Use the following diagram to answer questions 1-3. This diagram shows the incidences of a genetic disease for three generations. We assume that no new mutations occurred in the three generations shown on the diagram.
1. The genetic disease shown here is most likely
a. autosomal dominant
b. X-linked recessive
c. Y-linked recessive
d. X-linked dominant
e. either a or c
2. Which of the following pairs must be both carriers of the disease?
a. 1 and 5
b. 4 and 7
c. 13 and 16
d. 15 and 19
e. 7 and 9
3. Which of the following groups of three individuals may not be carriers of the disease?
a. 7, 15 and 19
b. 4, 15 and 19
c. 2, 6 and 16
d. 7, 15 and 16
e. 7, 10 and 19