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Ecology Exam 2 Chapter 7 1. Different forms of a particular gene are known as a. chromosomes. b. alleles. c. polygenic. d. pleiotropic. Answer: b 2. A trait that is determined by multiple genes is referred to as a. polygenic. b. pleiotropic. c. homozygous. d. heterozygous. Answer: a 3.Chickens with the dominant allele at the frizzle gene produce curly feathers, have very high body temperature, and lay few eggs. This is an example of a. polygenic traits. b. pleiotropy. c. epistasis. d. random assortment. Answer: b 4. Two of the genes that affect coat color in horses are the extension gene and the cream dilution gene. The dominant E allele at the extension gene generates black coats, while the recessive e allele produces red coats. The coat color caused by the extension gene is not altered if the horse is a homozygote for the C allele at the cream dilution gene. However, if the horse is a homozygote for the C Cr allele at the cream dilution gene, it will have a white coat regardless of the extension genotype. This interaction between the extension and the cream dilution gene is an example of a. pleiotropy. b. epistasis. c. codominance. d. random assortment. Answer: b 5. Which of the following types of allele would we expect to have the lowest frequency in a population? a. beneficial recessive allele b. beneficial dominant allele c. harmful recessive allele d. harmful dominant allele Answer: d 6. Consider a gene that affects fur color in mice. This gene has two alleles, A and a. If AA mice have white fur, Aa mice have gray fur, and aa mice have black fur, how would we describe the effect of these alleles? a. A is dominant and a is recessive. b. A is recessive and a is dominant. c. A and a are codominant. d. A and a are epistatic. Answer: c 7. Consider a gene that affects number of seeds in a plant. This gene has two alleles, G and g. If GG plants produce 50 seeds, Gg plants produce 50 seeds, and gg plants produce 25 seeds, how would we describe the effect of these alleles? a. G is dominant and g is recessive. b. G is recessive and g is dominant. c. G and g are codominant. d. G and g are poly