Exam 2: Genetics

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The products of a gene's transcription and translation determine aspects of the physiology, behavior, and morphology of living organisms. How does variation in genes relate to variation in the characteristics of the organisms?

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A key thing we are looking for is the recognition that underlying genetic variation can cause variation in the living organisms. The ideal answer might be close to this:
Genes are sequences of DNA (organized in chromosomes) that determine the shape and characteristics of proteins, which in turn are either enzymes or otherwise cause a chemical effect, or serve as part of the physical structure of cells, organs, or organisms. Variations among the genes therefore shape much of the variation in physiology, behavior, and functioning of the organism.

Which of the following is true of sickle-cell anemia?

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C

Mendel claimed that transmission from parent to offspring of alleles of a given gene is independent for each gene and its alleles. What does this mean?

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D

How does alternative splicing allow the same DNA sequence to code for more than one protein? Why is alternative splicing important in eukaryotes?

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Consider a cross between tall and short plants in which all of the offspring are tall. What does this suggest?

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How do enzymes control the chemical composition of cells?

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All cells in a multicelled organism have the same DNA. What does this mean?

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Recombination and crossing over are very important in the genetic process because they produce

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Why is it important to understand the overall relationship between genes, proteins, and chemical reactions in cells?

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Mendel crossed AABB with aabb individuals, where B = smooth, b = wrinkled, A = yellow, and a = green. What was the genotypic ratio of the F1 generation?

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If you have two parents with the genotype Aa, what is the chance that they will have an offspring with the genotype AA?

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Compare and contrast mitosis and meiosis. Include in your discussion for each process (a) the number of daughter cells produced and (b) the number of chromosomes each new cell contains. What are recombination and crossing over, and why are they important in the study of evolution?

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One of Mendel's pea plants with only green seeds is

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Imagine a cross between AA and Aa individuals. What is the genotypic ratio among the offspring?

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Which of the following occurs when DNA is replicated?

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A heterozygote is an individual with

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Under which circumstance does Mendel's principle of independent assortment hold?

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Which of the following statements is true of chromosomes?

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Which of the following is true of molecular genetics?

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Which of the following is true of DNA transcription/translation?

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