Union density in the United States is currently estimated at ____________________.

A) over 40 percent
B) about 25 percent
C) 20 percent
D) less than 15 percent

Which of the following is NOT true of colorblindness?

A) It is a hereditary trait carried on the X chromosome.
B) Protanopia involves a lack of or a decrease in sensitivity to the blue-sensitive cones.
C) Males and females can be colorblind, but the condition is more common in males.
D) Deuteranopia involves a lack of or a decreased sensitivity to green-sensitive cones.
E) All of these are true of colorblindness.

Which refers to the loss of a complete chromosome?

A) inversion
B) translocation
C) deletion
D) duplication
E) monosomy