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- 12. Darwin's finches provide an excellent example of macroevolution. True O False6. You have identified an autosomal gene that contributesto tail size in male guppies, with a dominant allele B forlarge tails and a recessive allele b for small tails. Femaleguppies of all genotypes have similar tail sizes. Youknow that female guppies usually mate with males withthe largest tails, but the effects of population densityand the ratio of the sexes on this preference have notbeen studied. You therefore place an equal number ofmales in three tanks. In tank 1, the number of femalesis twice the number of males. In tank 2, the numbers ofmales and females are equal. In tank 3, half as manyfemales as males are present. After mating, you findthe following proportions of small-tailed males amongthe progeny: tank 1, 16%; tank 2, 25%; tank 3, 30%.a. In your original population (before the animals wereplaced in the three tanks), 25% of the males havesmall tails. Assuming that the allele frequencies inmales and females are the same, calculate the frequencies of B and b in your…3. A population of sheep is in Hardy-We inberg equilib riu m. The alle le for white wool (W ) has an alle le fre quency of 0.1 9, and the alle le for black wool (w)has an alle le fre quency of 0.81 . Whatis the percentage of heterozygous in dividuals in the population?
- Which of the following situations will lead to natural selection? The seeds of two plants land near each other and one grows larger than the other Two types of fish eat the same kind of food, and one is better able to gather food than the other Male lions compete for the right to mate with females, with only one possible winner all of the aboveThe phenomenon in which chance events cause unpredictable changes in allele frequencies is called: a. gene flow. b. genetic drift. c. inbreeding. d. balanced polymorphism. e. stabilizing selection.If a population of skunks includes some individuals with stripes and others with spots, would you describe the variation as quantitative or qualitative?
- Sexual selection (a) occurs mainly among animals that practice polyandry (b) occurs when animals are very similar in their ability to compete for mates (c) results in animals that have lower direct fitness (d) occurs mainly among animals that practice polygyny (e) is a form of natural selectionAn Eastern European immigrant carrying the allele for Tay-Sachs disease settled in a small village on the St. Lawrence River. Many generations later, the frequency of the allele in that village is statistically higher than it is in the immigrants homeland. The high frequency of the allele in the village probably provides an example of: a. natural selection. b. the concept of relative fitness. c. the HardyWeinberg genetic equilibrium. d. phenotypic variation. e. the founder effect.11. A small group of finches from the mainland United States get blown off course during a hurricane and are focused to settle on an island off the coast of Georgia. Most of these birds have a recessive trait for yellow spots on their wings which is not a common trait among this speciet. Over several generations the entire population of these finches on the island have this expressive trait. This is an example of ____.
- 3. The recessive allele foccurs with a frequency of 0.41 in a population of orange clownfish (Amphiprion percula) which are at Hardy-Weinberg Equilibrium. Provide all genotype frequencies in this population.5. In com. purple kemels are dom inant to yello w. A random sample of I 00 kemels is taken from a popu la tion in Hardy-We inberg equilib riu m. It is found that 9 kemels are ye llo w and 91 ke mels a re purple. Whatis the frequency of the yellow allele in this population?4. The roof rat (Rattus rattus) and the Norway rat (Rattus norvegicus) are unable to interbreed because their F1 progeny die during embryogenesis. This type of reproductive isolation is best described as: A. a post-zygotic barrier known as behavioral F, inferiority B. a post-zygotic barrier known as F, hybrid breakdown C. a post-zygotic barrier known as ecological F, inferiority D. a post-zygotic barrier known as F, hybrid sterility E. a post-zygotic barrier known as F, hybrid inviability