Which of the following statements describes what all members of a population share?
They are members of the same species
If an allele makes up one fourth of a population's alleles for a given trait, its relative frequency is
In many kinds of organisms, most heritable differences are due to (hint: compares yourself to a family member)
gene shuffling during gamete formation
A single-gene trait that has two alleles and that shows a simple dominant-recessive pattern will result in
When individuals at only one end of a bell-shaped curve of a phenotype frequencies have high fitness, the result is
When individuals with an average form of a trait have the highest fitness, the result is
The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called
the founder effect
What situation might develop in a population having some plants whose flowers open at midday and other plants whose flowers open late in the day?
The combined genetic information of all members of a particular population is the population's
The distribution of phenotypes for a typical polygenic trait can often be expressed as
a bell-shaped curve
The situation in which allele frequencies of a population remain constant is called
One of the conditions required to maintain genetic equilibrium is
no movement into or out of the population
The separation of populations by barriers such as rivers, mountains, or bodies of water is called
Which is the first step that occurred in speciation of the Galapagos finches?
arrival of the founding population
What term describes the assumed evolutionary relationship between very different organisms? (hint: evolutionary "tree")
Dr. Lynn Margulis argued that organisms ate each other, didn't digest what they ate, and that is the explanation for how macroevolution produced the
What prevents organic molecules from forming on their own and remaining intact today?
atmospheric oxygen is too reactive
The process by which two species, for example, a flower and a pollinating insect, evolve in response to each other is called
In the past, mass extinctions encouraged the rapid evolution of surviving species
by making new habitats available to them
To compare the relative ages of fossils, scientists sometimes use an easily recognized species called a(n)
WHy did oceans not exist on Earth nearly 4 billion years ago?
water remained a gas because Earth was very hot
A single species that has evolved into several different forms that live in different ways has undergone
Sharks, dolphins, and penguins all have streamlined bodies and appendages that enable them to move through water. These similarities are the result of
The genetic equilibrium of a population can be disturbed by each of the following EXCEPT
a large population size
One necessary condition for the evolution of the first life on Earth was
the presence of liquid water