Environmental Impact on Phenotype – Check Test

1. The two influences on the phenotype of an organism are

A genotype and adaptation.

B genotype and environment.

C environment and adaptation.

D environment and habitat.

2. Human identical twins can have different body weights.

This could be because they have different

A genotypes.

B parents.

C diets.

D brothers and sisters.

3. An example of a human phenotype which can be influenced

by the environment after completion of growth is

A eye colour

B skin colour.

C blood group.

D tongue – rolling.

4. Which experimental procedure would best show that

environment can affect plant growth?

A Grow genetically identical plants in different environments.

B Grow genetically different plants in different environments.

C Grow genetically identical plants in identical environments.

D Grow genetically different plants in identical environments.

Questions 5, 6 and 7 refer to an experiment on the arrowhead plant.

Genetically identical plants of this species were raised in different

situations. One was grown in still shallow water and another in deep

fast flowing water. After full development, the two plants differed as

shown in the diagrams below.

5. The two plants in the diagrams have

A different genotypes and were raised in the same environment.

B the same genotype and were raised in the same environments.

C the same genotype and different phenotypes.

D different genotypes and different phenotypes.

6. If buds from each plant are then grown in shallow water, both

new plants should show

A the phenotypes of their parents.

B changed phenotypes.

C different phenotypes.

D the same phenotype.

7. This experiment shows that changes in the phenotype

caused by the environment are

A not passed to offspring.

B important in evolution.

C cause changes in the genotype.

D not permanent.

8. Changes in the phenotype caused by the environment are not

significant in the evolution of new species because

A offspring inherit them.

B they are genetic changes.

C the changes are not passed to offspring.

D the environment may change.