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Terms in this set (20)
Specialized features of animals and plants that perform one or more useful functions are known as ________.
Some people can manipulate their ear muscles to move their ears slightly. These muscles are called _______.
_______ favors certain individuals over others with a greater ability to find food, or avoid enemies, or resist disease, or deal with any of a number of environmental conditions.
Based on genetic research, we now know that ___________ are the components in the theory of natural selection.
Mutation and Sexual recombination
states that an evolutionary transition which has resulted from at least several genetic changes is highly unlikely to be reversed by subsequent evolution.
is a general tendency for body size to increase during the evolution of a group of animals.
A major problem that Darwin encountered in trying to gain support from other naturalists for his theory of natural selection was that ______________.
Modern genetics had not yet been discovered.
Background and mass extinctions refer to _______________.
lownumbers and highnumbers of species going extinct, respectively
The punctuational model of evolution states that _______.
evolutionary changes must be associated with speciation; that is, with the rapid evolution of new species from others
Why is convergence convincing evidence that evolutionary changes are adaptive?
Two unrelated species that resemble one another in form so that they also live in the same way is unlikely to be an accident.
What led Charles Darwin to conclude that many different forms of life possess a common biological heritage?
His observation of the geographic distributions of living things.
The adaptation of long-necked tortoises compared to the short-necked tortoise was for:
reaching tall vegetation
Darwin's observations on the finches and tortoises were made on islands collectively known as the _____.
The sum total of the genetic components of a population or group of interbreeding individuals is known as the _____.
The chemical changes that genes undergo, called _____, provide much of the variability on which natural selection operates.
A _____ is a reproductive cell that contains only half of the chromosomes of an organism, produced for the purpose of sexual reproduction.
are rapid expansions of groups of organisms that have undergone remarkably rapid evolutionary expansion?one or more phyla, classes, orders, or families produce new genera or species during brief intervals of time.
occurs when a group of organisms arise that resemble taxa that have evolved separately in other radiations?for example, the resemblance between North American mammals and Australian marsupials.
are elongate bodies found within the nucleus of a cell that concentrate DNA within such eukaryotes as plants and animals.
The mixing that takes place from the combination of half the genetic material from each parent, _____, continually yields new combinations of genes and chromosomes along with mutations that are responsible for variability among organisms.
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