chapter 17 #1
Natural selection acts directly on...
Phenotypes.
The domain ____ is composed of the kingdom Eubacteria.
Bacteria.
What event do biologists consider a random change?
Genetic drift.
Evolutionary classification.
What did the Grants learn about mate choice from the Galapagos Finches?
Finches prefer mates with beaks similar in size to their own.
What can produce a duplicate gene?
Crossing-over during meiosis.
The domains composed of only unicellular organisms are...
Archaea and Bacteria.
A factor that is necessary for the formation of a new species is...
Reproductive isolation.
Which kingdom contains heterotrophs with cell walls of chitin?
Fungi
True or False? In the name Ursus maritimus,the word Ursus refers to the species.
False.
When individuals at only one end of a bell curve of phenotype frequencies have high fitness, the result is...
directional selection.
At any level of organization, groups that have biological meaning are referred to as...
Taxa.
Phenotypes produced for a given trait depends upon...
the number of genes that control the trait.
When classifying organisms, a monophyletic group includes one what?
Ancestor and all its descendants.
The allele frequencies of a population are more likely to change if...
Mating is not random
In organisms that reproduce asexually, most variation that can be inherited is due to...
gene recombination during sexual reproduction.
The domain _____ contains plants, fungi, protists, and animals--which are all eukaryotes.
Eukarya.
When individuals with an average form of a trait have the highest fitness the result is...
stabilizing selection.
What does cladistic analysis show about organisms?
The relative degrees of relatedness among lineages.
The domain that contains unicellular organisms that live in extreme environments is...
Archaea.
The situation in which allele frequencies in the gene pool of a population remain constant is called...
Genetic equilibrium.
What cell structures in eukaryotic cells contain DNA that can be used to determine evolutionary relationships?
Nuclei and Mitochondria.
If mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase?
Whether the mutation makes some lizards more fit for their environment than other lizards.
In contrast to Linnaean taxonomy, cladistic analysis considers only which kind of traits, or characters, for analysis?
Derived characters.
What situation might develop in a population having some plants whose flowers open at midday and other plants whose flowers open at midday and other plants whose flowers open late in the day?
Temporal isolation.