What Is Life? 2nd Edition by Jay Phelan

Exercise 24

Which of the following statements is correct regarding pedigree analysis?
A) Darkened squares or circles always represent individuals with the trait being traced.
B) White squares or circles always represent heterozygous individuals.
C) Horizontal lines connect siblings.
D) The length of the vertical lines is dependent on the relatedness between two individuals.
E) Squares represent females, and circles represent males.