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Starting with a cross between AA and aa in the P generation, the proportion of heterozygotes in the F2 progeny will be ___.
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E. coli cells were spread on two agar plates [one containing only agar (plate 1) and the second containing streptomycin (plate 2) which kills all cells except those that are resistant mutants]. Both plates were allowed to grow for several generations. Cells were collected from the agar plate WITHOUT streptomycin and spread again on a fresh agar plate containing streptomycin (plate 3). More mutants were observed on plate 3 than were observed on plate 2. The experiment demonstrates
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The base thymine is always paired with ___.
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Which of the following processes occurs in meiosis but not mitosis?
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Calico cats have a patchwork pattern of yellow and black spots. This pattern is an example of
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The presence of a ___ with a free 3'-OH group is essential for DNA polymerase to synthesize DNA since no known DNA polymerase is able to initiate chains.
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Which of the following processes does not contribute to changing allele frequencies in populations?
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An F2 generation in which the phenotypic ratio of the offspring is 9:7 is usually due to ___.
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9. What ratios typically result from crosses dealing with a single genetic locus?
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A set of Drosophila deletions was assembled as follows (the lines indicate the region that has been deleted)
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Angiosperms are pollinated only by bees?
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Which stage of prophase I of meiosis is characterized by the initiation of active pairing?
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In a mammal how many inactivated X chromosomes (Barr bodies) would be present in cells of individuals who were XXX?
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The F, G and H loci are linked in the order written. There are 30 map units between F and G, and 30 map units between G and H. If a plant F G h/f g H is testcrossed, what proportion of the progeny plants will be f g h/f g h if there is complete interference?
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Euploidy is
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19. Referring to question 18, how many different gametes will the black-furred, long-tailed P1 mice produce?
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After mutagen treatment, a molecule of 2-aminopurine (an adenine analogue) incorporates into DNA. During replication the
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A wild-type chromosome can be represented as ABC * DEFGH, and from this a chromosomal aberration arises that can be represented AED * CBFGH. This is known as
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A situation in which an organism has both haploid and diploid stages would be called ___.
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A biochemical mutant that must be supplied with a particular nutrient for growth
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