Genetic Counselors Are More Commonly Available for Diagnosing Some Diseases,and

Multiple Choice

Genetic counselors are more commonly available for diagnosing some diseases,and for helping in family planning.If a genetic counselor examines a pedigree chart and notices an occurrence of a disease in every generation,she has strong evidence that the disease is caused by

A) a new reoccurring mutation.
B) an autosomal recessive disorder.
C) an autosomal dominant disorder.
D) a chromosomal abnormality.
E) having an extra set of chromosomes.