Study Questions on Mendel Genetics

Study Questions on Mendel Genetics - Study Questions for...

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Unformatted text preview: Study Questions for Mendelian Genetics 1. How does the genotype determine the phenotype? Depends on allele and whether dominant or recessive. 2. The term "multiple alleles" refers to: a) b) c) d) e) characters determined by several loci heterozygous organisms versions of a gene that affect several traits in an organism presence of more than two versions of a gene in a population characters where codominance is visible 3. Set up a Punnett square for a cross between two groups of birds. One group is homozygous recessive for feather color (they are pink with genotype bb), and the other group is heterozygous and expresses the dominant blue allele (Bb). Both groups are heterozygous for scaly legs (Ss) and they express scaly, not smooth, legs. List the genotypes that could be produced from a cross between the members of the two groups, and list the phenotypes resulting from each genotype. Give the expected ratios for genotypes and phenotypes in the offspring generation, assuming that the color gene and the scaly gene occur on different chromosomes. 4. . Suppose we study the T locus and the P locus, each one has 2 alleles. We find that TtPp individuals produce 4 kinds of gametes, each present at 25%. What do we know? a) each locus is pleiotropic b) these loci control the same genetic trait c) these loci are on the same chromosome d) these loci are on separate chromosomes e) these loci do not assort independently 5. In a test cross, one of the parental organisms is always: a) homozygous dominant for all loci b) homozygous recessive for all loci c) heterozygous at one locus and homozygous dominant at the other d) heterozygous at one locus and homozygous recessive at the other e) heterozygous at all loci 6. For genotype AABbEess, what fraction of gametes is expected to be ABEs? a) b) c) d) e) 25% 33% 50% 75% 100% 7. In a population with 4 alleles for a particular gene, what is the maximum possible number of different heterozygote genotypes? a) 2 b) 3 c) 4 d) 5 e) 6 8. Researchers discovered a new allele in fruit flies that increases life span by 35%, increases stress tolerance, and reduces reproductive rates. The effects of this allele are: a) b) c) d) e) polygenic pleiotropic polyploid disruptive a result of artificial selection 9. In the 1960's and 1970's, the industrialized nations of the world embarked on a program (called the Green Revolution) to use technology to increase world food production. They provided special high-yield hybrid seeds to farmers in underdeveloped countries. The hybrid seeds were heterozygous at every locus. In industrialized nations, farmers typically buy hybrid seeds each year from seed companies, whereas the farmers in underdeveloped countries traditionally allow some plants in each field to reproduce and set seed. These seeds are the ones the farmers plant next year. When given the hybrid seeds, the farmers in the underdeveloped countries planted them and obtained excellent crop yields the first year. However, the following year they used traditional methods to obtain seeds, and were very disappointed to find much lower yields than in the previous year. In genetic terms, explain why these farmers got poor yields when they used traditional methods of obtaining seeds for the next year's planting. + Start 9. The diagram above represents an electophoretic gel for the protein ADH (alcohol dehydrogenase) sampled from a deer population. How many individuals are sampled in this gel? a) 2 b) 3 c) 4 d) 5 e) 6 10. How a) b) c) d) e) many different alleles of the ADH gene are visible in the above gel? 4 5 6 7 8 11. How many of the individuals shown on the gel are heterozygotes? a) 1 b) 2 c) 3 d) 4 e) 5 ...
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