Natural Selection
Organisms and Environments
Directions: Match the correct term with its definition.
1. ____ GENE
A. a trait that is expressed only when the determining
gene is in the homozygous condition
2. ____CELL
B. a gene that is fully expressed in the phenotype
3. ____RECESSIVE
C. members of the same species that live in the same
geographical area
D. the genetic makeup of an organism
4. ____ CHROMOSOME
5. ____VARIATION
E. found in the nucleus and made of DNA, contains the
genetic information needed to make new cells and
carry out cell functions
F. the physical appearance of an organism
6. ____DOMINANT
G. the action or fact of carefully choosing someone or
something as being the best or most suitable
7. ____SELECTIVE BREEDING
H. the basic physical and functional unit of heredity
made up of DNA
8. ____ POPULATION
I. process of characteristics being transmitted from
parent to offspring
9. ____ HEREDITIY
J. a form of artificial selection whereby deliberate
breeding results in desired traits in plants or animals
10. ____GENOTYPE
K. a distinct feature or behavior of the organism that
occurs to individuals within a population or species
11. ____PHENOTYPE
L. the basic structural and functional unit of living
organisms
12. ____ SELECTION
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