Evolution Of Populations Ch. 16: Question Preview (ID: 1920)


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The combined genetic information of all members of a particular population is the population’s
a) relative frequency. b) phenotype c) genotype d) gene pool.
Which statement below about gene pools is typically true?
a) The relative frequencies of the alleles never change. b) They belong to two or more interbreeding species. c) They contain only dominant alleles. d) They contain two or more alleles for each inheritable trait.
nterbreeding among members of a population results in
a) an absence of genetic variation in the population. b) no changes in the relative frequencies of alleles in the gene pool. c) changes in the relative frequencies of alleles in the gene pool. d) different types of alleles in the gene pool.
In a population, the sum of the relative frequencies of all alleles for a particular trait is
a) equal to the number of alleles for the trait. b) constantly changing. c) dependent on the number of alleles. d) equal to 100 percent.
The two main sources of genetic variation are
a) genotypes and phenotypes. b) gene shuffling and mutations. c) single-gene traits and polygenic traits. d) directional selection and disruptive selection.
Gene shuffling includes the independent movement of chromosomes during meoisis as well as
a) mutations from radiation. b) changes in the frequencies of alleles. c) crossing-over. d) mutations from chemicals.
The gene shuffling that occurs as part of sexual reproduction
a) changes the gene pool’s allele frequencies. b) does not change the gene pool’s allele frequencies. c) is caused by radiation or chemicals. d) keeps the phenotypes consistent.
single-gene trait that has two alleles and that shows a simple dominant-recessive pattern will result in
a) one phenotype. b) four phenotypes. c) two phenotypes. d) millions of phenotypes.
The number of phenotypes produced for a given trait depends upon
a) the number of genes that control the trait. b) which form of the trait is dominant. c) the relative frequencies of the various alleles. d) the relationship of allele frequencies to Mendelian ratios
Compared to a polygenic trait, a single-gene trait tends to have
a) more phenotypes. b) fewer phenotypes. c) the same number of phenotypes. d) phenotypes that form a bell-shaped curve.
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