Unit 2 Exam

A  because there is over-population and species survival depends on a new species evolving.

B  when interbreeding between two different species results in less successful hybrid offspring.

C  males and females don’t like each other very much and so prefer not to mate.

D  when there is extensive gene flow within a single species.

A  is not the only pattern of speciation observed in the natural world.

B  one possible explanation of speciation accepted by biologists today.

C  is called the theory of phyletic gradualism.

D  one possible explanation of speciation accepted by biologists today, is not the only pattern of speciation observed in the natural world and is called the theory of phyletic gradualism.

A  punctuated equilibrium.

B  gradualism.

C  parallel evolution.

D  microevolution.

A  natural selection is a powerful process.

B  new mutations are usually maladaptive.

C  environments change slowly.

D  gene flow between individuals within the population keeps them similar to each other.

A  gene flow among members of the same species.

B  genetic drift within populations.

C  they way natural selection favors particular traits suited to a specific ecological niche.

D  sexual selection between two different species

A  homology.

B  adaptive radiation.

C  generalization.

D  parallel evolution.

A  sympatric speciation.

B  allopatric speciation.

C  migration

D  extinction

A  small scale evolutionary changes within a single generation

B  the relationship between humans and other animals in their ecological niche

C  large scale evolutionary change such as speciation

D  how the evolution of one species affects the evolution of another species

A  evolutionary change within a species.

B  the formation of new species.

C  the extinction of a species.

D  the death of individuals in a group.

A  the change in allele frequencies from one generation to the next

B  the change from one species to another in one generation

C  the appearance of new species

D  any type of genetic mutation

A  genetic drift

B  mutation

C  All of these forces may disrupt equilibrium.

D  gene flow

A  the production of new genetic material

B  the chance loss of alleles in a population

C  the differential reproductive success of individuals

D  the exchange of genes between populations

A  equilibrium in genetic frequencies.

B  maladaptive changes in gene frequencies.

C  changes in gene frequencies that are random with respect to adaptation.

D  adaptive changes in gene frequencies.

A  large populations.

B  populations out of equilibrium.

C  medium-sized populations.

D  small populations.

A  recombination

B  genetic drift

C  mutation

D  migration

A  are shaped by many genes, each with only a small effect on the phenotype.

B  can be greatly impacted by the environment during an individual’s growth and development.

C  all of these are important in shaping continuously varying traits

D  are affected by genes at many loci.

A  genetic drift

B  mutation

C  natural selection

D  migration

A  All of these are ways that genetic variation remains within a population.

B  New variation is slowly added by mutation.

C  There is no blending during sexual reproduction.

D  Mutations can be hidden in the heterozygous genotype.

A  do not differ between male and female animals.

B  the somatic cells of the body.

C  the sex cells or eggs and sperm.

D  were discovered by Darwin.

A  allele

B  mutation

C  gene

D  genetic drift

A  One chromosome from each homologous pair is passed on to gametic cells during meiosis.

B  These are all true about choromsomes

C  Chromosomes come in pairs.

D  Hereditary material is contained in the chromosomes.

A  mendelian trait

B  non-genetic trait

C  polygenic trait

D  dominant trait

A  beak size is inherited so the next generation had a larger average beak size

B  a large number of the birds had died as a result of the drought

C  The Grants found all these things as part of their study.

D  the survivors of the drought had a larger average beak size

A  never changed because of stasis

B  changed because equilibrium existed in the population

C  never changed because of high juvenile mortality

D  changed over time because of environmental change

A  directional selection

B  averaging selection

C  disruptive selection

D  stabilizing selection

A  are components of organisms that enable them to survive and reproduce.

B  allow organisms to evolve more rapidly.

C  cannot be passed from parent to offspring.

D  almost always occur by chance alone.

A  evolutionary change would proceed in a nonadaptive direction.

B  traits are not inherited by offspring.

C  there is no competition.

D  there are no differences in the traits to be favored and affect survival and reproducation.

A  the struggle for existance.

B  the inheritance of variation.

C  variation in fitness.

D  Natural selection is based on all three of these answers.

A  individuals with useful adaptations will be more likely to survive and reproduce.

B  while organisms within a population reproduce rapidly, resources are limited.

C  all of these are essential elements of natural selection.

D  individuals within a population vary.