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Recent questions in Biology
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18. A species of mice can have gray or black fur and long or short tails. A cross between black-furred, long-tailed mice and gray-furred, short-tailed mice produce all black-furred, long-tailed offspring. Using the gene symbols G for black, g for gray, S for long and s for short, what would be the genotype of a gray-furred, short-tailed mouse?
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A series of two-point mapping crosses indicated the following map distances involving A, D, and G and the additional genes B, C, E and F.
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The technique used to separate molecules on the basis of their different rates of movement in an electric field is known as ____.
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In swine, when a pure-breeding red is crossed with a pure-breeding white the F1 are all red. However, the F2 shows 9 red, 1 white and 6 of a new color, sandy. The Sandy phenotype is most likely determined by
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16. Starting with a P generation with the following genotypes (AABB x aabb). Based on classical Mendelian inheritance, what is the expected phenotypic ratio observed among the F2 progeny?
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Spores do not include a generative cell and a vegetative cell?
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30. Biochemist who discovered restriction endonucleases, one of the key tools for genetic engineering.
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The sequence of one strand of DNA is 5
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A plant of genotype C/C; D/D is crossed to c/c; d/d and an F1 testcrossed to c/c;d/d. If the genes are unlinked, the percentage of c/c;d/d recombinants will be
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In Drosophila, the two genes w and sn are X-linked and 25 map units apart. A female fly of genotype w+ sn+/w sn is crossed to a male from a wild-type line. What percentage of male progeny will be w+ sn?
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Forty units of enzyme A are needed to produce a wild-type phenotype. The wild-type allele produces 20 units and a new
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10. There are three different genotypes resulting from a monohybrid cross. How many different genotypes would there be resulting from a dihybrid cross?
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A plant of genotype C/C;d/d is crossed to c/c;D/D and an F1 testcrossed to c/c;d/d. If the genes are linked and 40 map units apart, the percentage of c/c;d/d recombinants will be
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During prophase of mitosis ___.
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Apply the rules of multiplication to a coin-flip situation. What is the probability that on three flips of a coin, heads will occur on all three flips?
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15. Albinism, lack of pigmentation in humans, results from an autosomal recessive gene designated a. Two parents with normal pigmentation have an albino child. What is the probability that their next child will be albino? What is the probability that the next child will be an albino girl?
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12 years
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What ratios typically result from crosses dealing with a single genetic locus?
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A base change resulting in a codon specifying the same amino acid as found in the wild-type polypeptide.
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8. Probabilities are calculated using the multiplication rule when they ___.
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The plant structure that has four whorls of modified leaves?
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