Evolution Flashcards
The concept of gene flow is demonstrated when a cow is driven off from its herd, joins another herd, and reproduces. When the cow contributes to the gene pool of the new herd, which of these most likely increases?
genetic variation
A large population of cockroaches was sprayed with an insecticide. A few of the cockroaches survived and produced a population of cockroaches that was resistant to this spray. What can best be inferred from this example?
individuals with favorable variations survive and reproduce
Which process produces the most variation within a species?
sexual reproduction
Over time, the climate of an island became drier, which resulted in changes to the populations of various island finch species. Finch populations with a certain beak shape thrived, while those not having that beak shape decreased. Which of the following describes a necessary condition for these changes in the finch populations to occur.
limited food resources
Which of the following can be determined by observing developing embryos?
certain organisms share common ancestry
Which of the following best illustrates natural selection?
an organism with favorable genetic variations will tend to survive and breed successfully
What is the best explanation for the continual changes in the classification system of organisms?
technological advances allowed scientists to better compare organisms
A large group of brown mice live in a coastal area. One day, a flood creates a river, separating the mice into two separate groups. Hundreds of years later, the mice on on side of the river are mostly dark brown while mice on the other side of the river are mostly light brown. This scenario best demonstrates which pattern of evolution?
Divergent Evolution
Which type of reproduction leads to increased genetic variation on a population?
sexual reproduction
How are sexual reproduction and asexual reproduction different?
asexual reproduction produces offspring identical to the parents, but sexual reproduction produces offspring with traits
The differences in the bird beaks Darwin observed are most likely a result of
available food sources
Some organisms are able to reproduce asexually through mitosis, while cells of organisms that reproduce sexually, will undergo meiosis to produce gametes. Which process do you predict would be most beneficial to a species during a drastic change in environmental conditions?
Meiosis; it results in more genetic variation, which would help ensure the species will survive
Mutations within a DNA sequence are
natural processes that produce genetic diversity
Evolution
Change over time
Homologous Structures
Similar ins structure and evolved from a common ancestor (whale flipper and human arm)
