Original population Equal
frequency
of black
and white
alleles
Allele frequency
differs
New population increase
New population increase
Chance event reduces
population size
Chance event reduces
population size
1. The model shows a demonstration a student prepared
using black and white marbles to show how populations of
organisms can change. Which of the following concepts is
best illustrated by this demonstration?
A Evolution of a predatory species
B Genetic drift accompanying natural selection
C Environmentally induced genetic mutations
D Immunity from virulent microorganisms
A
B
C
D

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Which of the following types of reactions would decrease the entropy within a cell? a. dehydration reaction, b. hydrolysis, c. respiration, d. digestion, e. catabolism.