Genetics From Genes to Genomes Study Set 1

Biology

Quiz 5 :

Linkage, Recombination, and the Mapping of Genes on Chromosomes

Quiz 5 :

Linkage, Recombination, and the Mapping of Genes on Chromosomes

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A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table. img img -Using the chi-square test for goodness of fit, how many degrees of freedom are in this data set?
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C

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In peas, tall (T)is dominant to short (t), red flowers (R)is dominant to white flowers (r), and wide leaves (W)is dominant to narrow leaves (w).A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves.The resulting progeny are shown in the table. img -What is the genotype of the tall plant that has red flowers and wide leaves?
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B

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A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table. img img -The chi-square value is the sum for all progeny classes of (observed-expected)2/expected.Using the chi-square test for goodness of fit, calculate the chi-square value to test the null hypothesis that genes C and D are unlinked.What is the chi-square value?
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D

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Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows: img -Which of the three genes is in the middle?
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What is a reasonable conclusion based on the chi-square analysis?
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In peas, tall (T)is dominant to short (t), red flowers (R)is dominant to white flowers (r), and wide leaves (W)is dominant to narrow leaves (w).A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves.The resulting progeny are shown in the table. img -If two or more of the genes are linked, what map distance separates them?
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A dihybrid testcross is made to determine if genes C and D are linked.The results are shown in the table. img img -Given this data, use Table 5.2 to find the most accurate range within which the p value falls.
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What is the coefficient of coincidence in this region?
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What is the coefficient of coincidence in this region?
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In peas, tall (T)is dominant to short (t), red flowers (R)is dominant to white flowers (r), and wide leaves (W)is dominant to narrow leaves (w).A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves.The resulting progeny are shown in the table. img -This cross is not useful to determine if one of the genes is linked to the others.Which gene?
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If only 100 progeny had been counted and the same proportions of progeny genotypes observed, how would the p value and the conclusion drawn about linkage change?
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Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows: img -What is the genotype of the females that gave rise to these progeny?
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Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations.The offspring are as follows: img -Which of the following linkage maps correctly shows the order and distance between the px, sp, and cn genes?
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Suppose the L and M genes are on the same chromosome but separated by 100 map units.What fraction of the progeny from the cross L M / l m × l m / l m would be L m / l m?
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The pairwise map distances for four linked genes are as follows: A-B = 22 m.u. , B-C = 7 m.u. , C-D = 9 m.u. , B-D = 2 m.u. , A-D = 20 m.u. , A-C = 29 m.u.What is the order of these four genes?
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Which of the following linkage maps correctly shows the order and distance between the y, f, and v genes?
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In Drosophila, singed bristles (sn)and cut wings (ct)are both caused by recessive, X-linked alleles.The wild-type alleles (sn+ and ct+)are responsible for straight bristles and intact wings, respectively.A female homozygous for sn and ct+ is crossed to a sn+ct male.The F1 flies are interbred.The F2 males are distributed as follows: img What is the map distance between sn and ct?
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The zipper-like connection between paired homologs in early prophase is known as a
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The R and S genes are linked and 10 map units apart.In the cross R s / r S × r s / r s what fraction of the progeny will be R S / r s?
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If the map distance between genes A and B is 20 map units and the map distance between genes B and C is 35 map units, what is the map distance between genes A and C?
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