Bottleneck and founder effects are situations that make what condition more likely to affect allele frequencies in a population?

A) nonrandom mating
B) natural selection
C) genetic drift
D) mutation

In the United States, the biggest increases in Canada geese have been among ____ birds that live where humans are ____.

A) only migratory; plentiful
B) only migratory; scarce
C) only nonmigratory; plentiful
D) only nonmigratory; scarce
E) both migratory and nonmigratory; scarce

The mechanism for concentration of urine is called the ________ mechanism.

A) countercurrent
B) filtration
C) secretion
D) reabsorption
E) concentration

The portion of a hair that protrudes above the surface of the skin is the ________.

A) hair bulb
B) hair root
C) hair shaft
D) hair follicle
E) dermal papilla

Upon observing a cell of a grass blade, you notice a prominent sac that occupies a large portion of the cell. Which organelle is this?

A) nucleus
B) vacuole
C) lysosome
D) chloroplasts
E) mitochondria

The central nervous system develops from a flat mass of tissue called the neural ________.

A) groove
B) tube
C) plate
D) crest
E) fold