Quiz+3+Inclass 7 in class quiz easy level PDF

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Date: 7.21.21

In class quiz Indicate the answer choice that best completes the statement or answers the question.

1. Mutation has what effect on a population? a. It creates or increases genetic variation. b. It promotes the fixation of alleles. c. It reduces the amount of genetic variation. d. It homogenizes genetic variation across populations. e. It increases rates of outcrossing. 2. If the relative fitness of the A1A1 genotype is 0.6, A1A2 is 1.0, and A2A2 is 0.9, eventually the frequency of the A2 allele will be: a. 0.8. b. 0.2. c. 0.0. d. 0.4. e. 0.6.

3. If there is random mating in a population and no evolutionary forces are acting on the population, what will be the expected outcome? a. The allelic frequencies will remain the same, but the genotypic distribution will change. b. The genotypic distribution will remain the same, but the allelic frequencies will change. c. Both the genotypic distribution and the allelic frequencies will change. d. Both the genotypic distribution and the allelic frequencies will remain the same. e. No prediction can be made about the genotypic distribution and allelic frequencies from one generation to the next.

4. The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E with additive alleles. The shortest plants are 130 cm. The tallest plants are 220 cm. The genotypes are known for two bean plants. Plant 1 is genotype AABbccDdEE. Plant 2 is genotype aaBBCcDdEE. If the progeny plant from an AbcdE gamete from plant 1 (AABbccDdEE) and an aBcdE gamete from plant 2 (aaBBCcDdEE) was a few centimeters taller than your prediction, what is the most likely reason? a. Crossing over occurred within the A–E region that created recombination in the progeny. b. The height trait is likely also influenced by environmental conditions as well. c. The genes A–E do not actually work in an additive manner but rather in a dominant mode of inheritance. d. Multiple alleles must be present in at least two of the loci involved. e. There are actually more loci involved than just genes A–E. Copyright Macmillan Learning. Powered by Cognero.

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In class quiz 5. You are studying cannibals in Borneo and collect the following data with the two codominant M and N blood type alleles (LM, LN) segregating at the single-gene locus. What are the genotypic and allelic frequencies for this population? Phenotypes a. LM LM = 0.287, LM LN = 0.665, LN LN = 0.123; LM = 0.885, LN = 0.115 b. LM LM = 0.267, LM LN = 0.619, LN LN = 0.114; LM = 0.5, LN = 0.5 c. LM LM = 0.267, LM LN = 0.619, LN LN = 0.114; LM = 0.267, LN = 0.114 d. LM LM = 0.267, LM LN = 0.619, LN LN = 0.114; LM = 0.576, LN = 0.424 e. LM LM = 0.287, LM LN = 0.665, LN LN = 0.123; LM = 0.576, LN = 0.424

6. Suppose that researchers estimate that broad-sense heritability of IQ in Sweden is 0.8. Which of the following conclusions is valid, assuming that the estimate is accurate? a. Most variance for IQ in Sweden is due to total genetic variance. b. In Sweden, the environment does not play a large role in determining the IQ of individuals. c. Enriching the environment of poor children in Sweden would not lead to a big improvement on IQ tests. d. Broad-sense heritability of IQ in the United States is probably also close to 0.8. e. If another country has a lower broad-sense heritability for IQ, then this difference must be genetically based.

7. Genetic diseases in humans are usually rare and recessive. Why are the frequencies of alleles that cause rare, recessive diseases (or other recessive traits, for that matter) generally much higher than the frequency of the diseases (or traits) themselves? a. Diseases caused by dominant alleles are generally lethal, and so most diseases are caused by recessive alleles. b. Most of the rare, recessive alleles within the population are "hidden" within heterozygote carriers, which do not manifest the disease (or express the trait). c. Mutation rates are very low, and so recessive alleles are rare, which results in few recessive disease traits. d. Most recessive mutations are lethal; as a result there are few recessive diseases. e. Detrimental alleles are always being removed from a population due to natural selection.

8. Phenotypic variation in a trait is often represented as a _____, which graphs the number of each phenotypic Copyright Macmillan Learning. Powered by Cognero.

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In class quiz class in a sample. a. bimodal distribution b. frequency distribution c. regression line d. correlation e. variance plot 9. _____ ultimately produces all new genetic variation in a population. a. Outcrossing b. Migration c. Evolution d. Mutation e. Equilibrium 10. Use Figure 25.4 to determine the BEST answers for the following question. When a population is in Hardy–Weinberg equilibrium, what is the approximate frequency of the aa homozygote and the Aa heterozygote when the frequency of AA is approximately 0.5? a. aa = 0.25, Aa = 0.25 b. aa = 0.25, Aa = 0.5 c. aa = 0.02, Aa = 0.48 d. aa = 0.1, Aa = 0.4 e. aa = 0.4, Aa = 0.1

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In class quiz

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