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31 Cards in this Set

  • Front
  • Back
Who developed the first classification system for living organisms?
Carolus Linnaeus
Putting his observations together, Darwin developed his theory of descent with modification also known as:
natural selection
Over the course of systematics, or classifying living organisms, biologists have identified ________species in the world today
1.5 million
How does the antibiotic penicillin kill bacteria?
It inhibits bacterial cell wall synthesis
Differences between families, individuals, and races illustrate what biological concept
The three levels of human variation
Insects dominate the living world by having the largest number of different species. This is largely attributed to their:
small size and short reproductive cycle
Selecting a desirable trait from the random variations that occur in the population is the definition of:
selective breeding
A certain species of bird gradually becomes darker in color because this darker color helps these birds to escape predators. A disease causing bacteria becomes resistant to penicillin. Both of these phenomena represent:
natural selection
Speciation is a process by which
two populations achieve reproductive isolation.
There are over 300 breeds of dogs. Breeds are:
-composed of individuals within one species that share many traits.
-developed artificailly through selective mating.
Biologists who study the classification of living organisms are referred to as:
When we make major alterations to the earth's surface, such as clearing many acres of rain forest or draining wetlands to produce farmland, we may cause species to become extinct because we are:
-causing extensive environmental
-acting as a competitor for resources.
A group of animals that share many traits through selective breeding is
The formation of a new species as a result of two populations becoming isolated by a geographical barrier is called:
allopatric speciation
The organism that causes malaria is the
Punctuated equilibrium is characterized by:
-a single large mutation of an ancestral species to a new species.
-a new species that is a subpopulation of an ancestral species.
-the absence of transitional links.
-speciation occurs rapidly
Darwin's theory of natural selection is mainly concerned with:
how adaptations evolve
genus is
a group of closely related species
What type of animal makes up the majority of all species in the world
The selective force for the survival of the sickle cell allele is:
plasmodium, the parasite that causes malaria
What force maintains the change in living organisms
natural selection
Phyletic gradualism is characterized by
the gradual transformation of an ancestral species to a new species
With this classification scheme organisms are first placed in one of 8 major groups known as:
During the process of natural selection, four things take place, including which of the following:
both competition for resources and more offspring being produced than will survive.
Small-scale extinction occurs
All members of the same species have the ability to _____ ___ ____ ____
reproduce with each other
Speciation is
formation of a new species from an existing one
Environmental changes result in:
Who was the first to solve the mystery of heredity?
Gregor Mendel
basic unit of classification of biological organisms is the:
What is the correct order of the following classification units within the biological classification system, starting with the largest (
Kingdom, Phylum, Class, Order, Family, genus, species