Biology Worksheets – Section Three
1. The diagram below illustrates what happens to the fur coloration of a Himalayan
hare after exposure to a low temperature.
This change in fur coloration is most likely due to
A. the effect of heredity on gene expression
B. the arrangement of genes on homologous chromosomes
C. environmental influences on gene action
D. mutations resulting from a change in the environment
The diagram below represents undisturbed rock strata in a given region. A
representative fossil of an organism is illustrated in each layer.
2. Which statement best describes a relationship between these representative
A. Organism A was probably more structurally advanced than organism B
and organism C.
B. Organism C probably gave rise to organism A and organism B.
C. All of these organisms probably evolved at the same time.
D. Organism A was probably more primitive than organism B and organism C
3. In the early stages of development, the embryos of birds and reptiles resemble
each other in many ways. This resemblance suggests that they
A. belong to the same species
B. are adapted for life in the same habitat
C. share a common ancestry
D. are both animal-like protests
4. In addition to the basic ideas of Darwin, the modern theory of evolution includes
the concept that
A. variations are the result of mutations and gene recombination
B. overproduction of organisms leads to extinction.
C. variations exist only in large populations
D. competition occurs only between members of the same species
G. What will most likely happen if the gene frequencies in a given population remain
A. Recessive characteristics will increase in the population.
B. Evolution will not take place within that population.
C. Dominant characteristics will increase in the population.
D. Evolution within that population will occur at a faster rate.
H. Some species undergo long periods of stability interrupted by geologically brief