Exam 4: Biodiversity and Evolution

Earth's variety of deserts,forests,and grasslands are all examples of _____________________.​

Species that are found in only one area are called ____________________ and are especially vulnerable to extinction. ​

When biologists talk about the "survival of the fittest",the fittest individuals are those that leave the most descendants,not those that are physically the strongest.

____________________ are mineralized or petrified replicas of skeletons,bones,teeth,shells,leaves,and seeds,or imprints of such items found in rocks.

Match the type of diversity with the proper choice below. -Oregon and Washington have wet,dry,and high elevation regions.​

In a population of wild bees, a mutation resulted in slightly larger wingspan in some of the bees. This larger wingspan made the bees more efficient in their flights to flowers to collect nectar. Thus, these bees became more successful. This trait was passed on to offspring, and eventually the larger wingspan variety of bee replaced their smaller-winged relatives completely. -It could be said that ____ favored the bee with the larger wingspan,and so the ____ evolved.​

Mutations can occur in any cell type,however only those that occur in ____________________ are passed on to offspring,thus allowing for evolution.

Those species that normally live and thrive in a particular ecosystem are ____.​

The process by which members of isolated populations become so different in genetic makeup that they cannot produce live,fertile offspring if they are rejoined is best described as ____.​

Match the type of diversity with the proper choice below. -Coral reefs are known for their very high number of species.​

​All nonnative species threaten ecosystems.

For every shark that injures or kills a person every year,we ____.​

Deserts,tropical forests,prairie grasslands,and coniferous forests have distinct climates and certain species,and are all examples of ____.​

Which organism would best be described as a specialist species?​

A heritable trait that improves the ability of an individual organism to survive and to reproduce at a higher rate than other individuals in a population is called a(n)____.​

____________________ are random changes in the structure or number of DNA molecules in a cell.​

Typically speaking,organisms that are described as ____________________ tend to have broad niches.​

Specialist species occupy ____.​

​Cockroaches have a wide range of tolerance of environmental conditions.They are known as a specialist species.

How does natural selection change the genetic makeup of a population over time?