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Recent questions in Biology
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In Drosophila the recessive alleles for brown and scarlet eyes (resulting from two independent genes) interact so that the double homozygous recessive is white. A pure-breeding brown and pure breeding scarlet are crossed. What proportion of the F2 will be white?
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11. The base thymine is always paired with ___.
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The maize genes sh and bz are linked, 40 map units apart. If a plant sh+ bz/sh bz+ is selfed, what proportion of the progeny will be sh bz/sh bz?
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Biology
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Antheridia are formed in gymnosperms and angiosperms?
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17. In the previous question, if A = plain fur and a = spotted fur and B = Long ears and b = short ears, what phenotypic class would be observed in the highest proportion in the F2 generation?
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12 years
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Biology
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Considering the structure of double stranded DNA, what kinds of bonds hold one complementary strand to the other?
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Biology
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Which of the following is NOT necessary in order for a population to maintain Hardy-Weinberg equilibrium?
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7. Probabilities are calculated using the addition rule when they ___.
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The basic principle that DNA makes RNA makes protein is referred to as the __.
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The purpose for check points in the cell cycle is to
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24. In a F1 dihybrid cross (WwGg X WwGg) where W = round, w = wrinkled, G = yellow and g = green, what is the probability of obtaining an individual that is wrinkled, green and true-breeding?
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12 years
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The fundamental Mendelian process which involves the separation of alleles would be called ___.
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A plant that produces a protonema?
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The probability that five children in a family will all be males is
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A cross was made between an aaddGG female and an AADDgg male. The resulting F1 females were testcrossed and 1000 offspring were produced. The F2 phenotypes and numbers were:
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Two genes with a 50% recombination frequency are
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The maximum recombination frequency between two genes is
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In crosses involving two different unlinked traits, the ratio 9:3:3:1 indicates ___.
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In the previous question, Barney and Betty learn that they will actually have twins - dizygotic twins (from two different eggs). What is the probability that they will have both a boy and a girl, both of whom are flat-footed?
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A situation in which an allele causes inviability when present in two doses is called
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