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Candace Harkey |
1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Question: Population genetics is the study of ________.
Choices:
how allele frequencies in a population change over time
populations of cells in an individual
the rate of population growth
how genes affect embryological development
Question: Which scientific concept did Charles Darwin and Alfred Wallace independently discover?
Choices:
mutation
natural selection
overbreeding
sexual mutation
Question: Which of the following situations will lead to natural selection
Choices:
The seeds of two plants land near each other and one grows larger than the other
Two types of fish eat the same kind of food, and one is better able to gather food than the other.
Male lions compete for the right to mate with females, with only one possible winner.
All of the above
Question: What is the difference between micro- and macroevolution?
Choices:
Microevolution describes the evolution of small organisms, such as insects, while macroevolution describes the evolution of large organisms, like people and elephants.
Microevolution describes the evolution of microscopic entities, such as molecules and proteins, while macroevolution describes the evolution of whole organisms.
Microevolution describes the evolution of populations, while macroevolution describes the emergence of new species over long periods of time.
Microevolution describes the evolution of organisms over their lifetimes, while macroevolution describes the evolution of organisms over multiple generations.
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