WorksheetsMechanisms of Evolution (including selective breeding)
Total questions: 17
Worksheet time: 10mins
A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.
Gene Flow
Genetic Drift
During gestation (pregnancy), a developing male pig had a change in his genetic code. The result was that he to produce less nitrogenous solid waste.
Genetic Drift
Non-random mating
Mutation
Natural Selection
Bats are common in Texas, especially in rocky regions. Bats with longer hang claws have demonstrated higher fitness because of their ability to cling to rock while resting. This adaptation is becoming more frequent in the population. What mechanism of evolution is this?
Natural Selection
Non-random mating
Gene Flow
Genetic Drift
During a hurricane, a population of beetles almost gets completely wiped out. The only beetles that survived were lucky that they were in their nest at the time of the hurricane and had enough food to survive.
Natural selection
Genetic Drift
Gene Flow
Non-Random Mating
The country of Sweden is known for having people with blonde hair and blue eyes. One day a family moves from Sweden to India where dark hair and dark eyes are very common. A female from Sweden marries a male from India and their offspring now have blonde hair and blue eyed traits.
Natural Selection
Mutation
Non-Random Mating
Gene Flow
In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs
Genetic Drift
Natural Selection
Gene Flow
Mutation
Females a certain bird species are attracted to the mating calls of male species more than others
Genetic Drift
Mutation
Non-Random
Natural Selection
About 9,000-6,000 years ago, ancient people began to develop parviglumis teosinte into a crop that more closely resembles what we know today as corn. Its kernels started to grow without the tough shell, and humans domesticated this plant for its grain, changing the size and textures of the kernels. They accomplished this by selectively breeding parviglumis teosinte plants together that had larger and softer kernels so that this trait became more common in the next generation of plants. This is an example of...
gene flow
natural selection
genetic drift
artificial selection
What is natural selection?
a living individual that can carry out life processes
Process by which an organism that better adapts to their environment survive and reproduce
Process by which a community better adapts to their environment to give traits to one another within their generation.
the time between when an organism is born and when they reproduce
Evidence shows that the wolf is the ancestor to all of the breeds of dogs shown below. How did this variation arise in a relatively short period of time?
Genetic manipulation
Natural Selection
Random Chance
Selective Breeding
Natural Selection is defined as-
the process by which humans select the most desirable organisms in a population.
the changes that occur in an organism over its lifespan.
the changes that occur in a population that do not affect survival.
the changes in the characteristics within a population that lead to survival
Charles Darwin studied the finches of the Galapagos Islands and found that their beaks vary in shape. Darwin found that the finches that ate mostly insects had long, narrow beaks. Finches that ate mostly seeds had shorter, broad beaks that they used to crush seeds. Which statement below best describes how natural selection resulted in the four types of finches shown above?
The narrow-beaked finches came first, and evolved into the broad-beaked finches through a series of natural mutations.
The residents of the Galapagos Islands selectively bred finches that had the traits that the residents wanted them to have.
The broad-beaked finches wore down their beaks digging for insects and passed these narrower beaks on to their offspring.
Over time, the finches that were born with beaks better suited to the available food supply in their habitats survived and reproduced.
