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All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT: a) Male fireflies of different species have differing flash patterns. b) Three closely related orchid species flower on different days. c) The progeny of a cross between two different lizard species fail to develop properly. d) One species of snake lives in water and another is terrestrial. e) Peeper frogs mate in April, and tree frogs mate in June.

All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT: a) Male fireflies of different species have differing flash patterns. b) Three closely related orchid species flower on different days. c) The progeny of a cross between two different lizard species fail to develop properly. d) One species of snake lives in water … Read more

The appearance of a fertile, polyploid individual within a population of diploid organisms is a possible source of a new species. If this individual is capable of reproducing to form a new population, scientists would consider this to be an example of a) allopatric speciation b) sympatric speciation c) polygenic inheritance d) genetic drift e) Hardy-Weinberg equilibrium

The appearance of a fertile, polyploid individual within a population of diploid organisms is a possible source of a new species. If this individual is capable of reproducing to form a new population, scientists would consider this to be an example of a) allopatric speciation b) sympatric speciation c) polygenic inheritance d) genetic drift e) … Read more

In eastern gray squirrels, Sciurus carolinensis, the allele for black fur (B) is dominant to the allele for gray fur (b). In a particular population of gray squirrels, 64% have black fur and 36% have gray fur. A researcher calculated the allelic frequencies to be B=0.4 and b=0.6. Five years later, the researcher returned to the location and determined the allelic frequencies within the squirrel population to be B=0.6 and b=0.4. Which of the following could best explain the increase in the frequency of the B allele in the population after five years? a) the frequency of the B allele increased because it is the dominant allele b) the frequency of the B allele is increased because squirrels with gray fur exhibit greater fitness c) the frequency of the B allele increased due to the selective pressures of the environment d) the frequency of the B allele increased because black squirrels randomly mate with other eastern gray squirrels

In eastern gray squirrels, Sciurus carolinensis, the allele for black fur (B) is dominant to the allele for gray fur (b). In a particular population of gray squirrels, 64% have black fur and 36% have gray fur. A researcher calculated the allelic frequencies to be B=0.4 and b=0.6. Five years later, the researcher returned to … Read more

The fossil record indicates that in some cases reasonably well-defined species appear suddenly and remain unchanged for a long time before they become extinct. This phenomenon is referred to as a) allopatric speciation b) sympatric speciation c) phyletic gradualism d) punctuated equilibrium e) parallel evolution

The fossil record indicates that in some cases reasonably well-defined species appear suddenly and remain unchanged for a long time before they become extinct. This phenomenon is referred to as a) allopatric speciation b) sympatric speciation c) phyletic gradualism d) punctuated equilibrium e) parallel evolution

Gaucher disease type 1 (GD1) is a recessive genetic disease that affects 1 in 900 individuals in a particular population. GD1 is caused by a mutation in the enzyme glucocerebrosidase. Assuming the population is in Hardy-Weinberg equilibrium, calculate the frequency of the wild-type (nonmutant) allele for the enzyme glucocerebrosidase. a) 0.001 b) 0.033 c) 0.967 d) 0.999

Gaucher disease type 1 (GD1) is a recessive genetic disease that affects 1 in 900 individuals in a particular population. GD1 is caused by a mutation in the enzyme glucocerebrosidase. Assuming the population is in Hardy-Weinberg equilibrium, calculate the frequency of the wild-type (nonmutant) allele for the enzyme glucocerebrosidase. a) 0.001 b) 0.033 c) 0.967 … Read more

Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6. (a) What is the frequency of each genotype (AA,Aa,aa) in this population? What is the frequency of the dominant phenotype?

Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6. (a) What is the frequency of each genotype … Read more

Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6. (b) How can the Hardy-Weinberg principle of genetic equilibrium be used to determine whether this population is evolving?

Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6. (b) How can the Hardy-Weinberg principle of genetic … Read more

The condition in which there are barriers to successful interbreeding between individuals of different species in the same community is referred to as a) latent variations b) sterility c) structural differences d) geographic isolation e) reproductive isolation

The condition in which there are barriers to successful interbreeding between individuals of different species in the same community is referred to as a) latent variations b) sterility c) structural differences d) geographic isolation e) reproductive isolation

A survey reveals that 25 percent of a population of 1,000 individuals have attached earlobes (are homozygous recessive for the trait). Unlike most natural populations, this population is best characterized in which of the following ways? a) there is a genetic equilibrium b) there is gene flow c) there is genetic drift d) mutations occur e) mating is nonrandom

A survey reveals that 25 percent of a population of 1,000 individuals have attached earlobes (are homozygous recessive for the trait). Unlike most natural populations, this population is best characterized in which of the following ways? a) there is a genetic equilibrium b) there is gene flow c) there is genetic drift d) mutations occur … Read more

Female European corn borer moths (Ostrinia nubilalis) produce the sex pheromone 11−tetradecenyl acetate (11−TDA), which attracts males of their species. 11−TDA can be produced in two forms, E and Z, each with a different three-dimensional shape. Researchers have discovered two different strains of the European corn borer moth living in the same area. Females of the E strain produce primarily the E form of 11−TDA and females of the Z strain produce primarily the Z form of 11−TDA. Males of both strains are more attracted to the form of 11−TDA produced by the females of the same strain. Which of the following best predicts a long-term effect of the differences between the E and Z strains? a) the difference between the forms of the sex pheromone 11-TDA produced by E and Z strains will act as a prezygotic reproductive barrier leading to sympatric speciation b) The difference between the forms of the sex pheromone 11−TDA produced by E and Z strains will act as a postzygotic reproductive barrier, leading to allopatric speciation. c) Since the E and Z strains are both part of the same species, they will produce fertile offspring, leading to a single strain that produces both forms of 11−TDA. d) Since the E and Z strains are found in the same geographic area, they will hybridize, leading to a single strain that produces the dominant form of 11−TDA

Female European corn borer moths (Ostrinia nubilalis) produce the sex pheromone 11−tetradecenyl acetate (11−TDA), which attracts males of their species. 11−TDA can be produced in two forms, E and Z, each with a different three-dimensional shape. Researchers have discovered two different strains of the European corn borer moth living in the same area. Females of … Read more