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Assume that three pairs of autosomal alleles are found in Drosophila: x and y and +,...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that are homozygous recessive for the three traits. The three autosomal recessive traits are glassy eyes (g), coal-colored bodies (c), and striped thoraxes (t). The three dominant traits are red eyes (g+), gray bodies (c+) and solid thoraxes (t+) (remember, the wild-type allele has a + after it). You examine 1000 progeny of the above cross and they have the following phenotypic classes: 265 g+c+t+ 275 gct 120 g+ct...
Please help (2) In Drosophila there are three genes lozenge (z), singed (s), and crossveinless (c),...
Please help
(2) In Drosophila there are three genes lozenge (z), singed (s), and crossveinless (c), with each mutant allele recessive to the wild type allele. A cross between females heterozygous for these three loci and wild-type males yielded the following progeny: Females1010 Males + 39 430 +Cz 32 s27 C+ 441 SCz 31 Using these data, construct a linkage map (4 points) of the 3 genes and calculate the coefficient of coincidence (2 points) and interference (2 points).
In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
Question 3. From text book Male Drosophila expressing the autosomal recessive mutations sc (scute...
Question 3. From text book Male Drosophila expressing the autosomal recessive mutations sc (scute), ec (echinus), cv (crossveinless) and b (black) were crossed to phenotypically wild- type females, and the 3288 progeny listed were obtained. (Only mutant traits are noted.) 653 black, scute, echinus, crossveinless 670 scute, echinus, crossveinless 675 ild type 655 black 71 black, scute 73 scute 73 black, echinus, crossveinless 74 echinus, crossveinless 87 black, scute, echinus 84 scute, echinus 86 black, crossveinless 83 crossveinless 1 lack,...
In Drosophila, the autosomal recessive traits for dumpy wings (dp) and cinnabar eyes (cn) are found...
In Drosophila, the autosomal recessive traits for dumpy wings (dp) and cinnabar eyes (cn) are found on chromosome 2, separated by 44 map units. The allele for shaven bristles (sv) is found on chromosome 4 and is also recessive. A female with shaven. bristles is crossed to a male expressing dumpy wings and cinnabar eyes. FI females are test-crossed to males expressing all three traits. 3. What proportion of F2 flies (of either sex) will be completely wild type? a....
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on...
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on the Drosophila X chromosome (a, b, and c). Assume that you are starting out with true-breeding stocks that show all three recessive traits and true-breeding stocks that show all three dominant traits. A. If you wanted to do a 3-point test cross to map the three loci, how would you set up the cross? What genotypes do you use for males and females in...
In Drosophila melanogaster, the recessive X-linked alleles white (w), miniature (m) and forked (f) give the...
In Drosophila melanogaster, the recessive X-linked alleles white (w), miniature (m) and forked (f) give the phenotypes white eyes, miniature wings and forked brushes. The recombination between the w and m loci is 35%, and between the m and f loci, 20%. Wild-type males were crossed with females from a strain that was homozygous recessive for the three alleles, then the F1 flies were sibling mated. What phenotype frequencies are expected in F2 a) if there is no interference, and...
36. The recessive autosomal maize genes sh and bz are linked and 40 map units apart,...
36. The recessive autosomal maize genes sh and bz are linked and 40 map units apart, If a plant with the genotype sh bz/ sh bz is selfed, what percentage of the progeny will be double recessive? 37. If the recombination frequency between the linked autosomal genes A and B in Drosophila is 15 percent, what phenotypic frequencies would you expect from a cross AB/ab females x AB/ab males? (There is no crossing over in Drosophila males). 38. In the...
43. Genes a and b are X-linked and are located 7 mu apart on the X...
43. Genes a and b are X-linked and are located 7 mu apart on the X chromosome of Drosophila. A female of genotype a+ b/a b+ is mated with a wild-type (a+b+/Y). a. What is the probability that one of her sons will be either a+b+ or a b+ in phenotype? b. What is the probability that one of her daughters will be a+b+ in phenotype? 44. Three recessive autosomal mutations in Drosophila: a versus wild-type A. b versus B,...
Genetic Linkage The six genes listed below are all located on Chromosome 2 of Drosophila melanogaster....
Genetic Linkage The six genes listed below are all located on Chromosome 2 of Drosophila melanogaster. Your goal is to construct a genetic map of Chromosome 2. That is, determine the order of these genes along chromosome 2 and the map distance in centimorgans between each gene. To complete this task, you will be given the results of a variety of two-point test crosses involving these genes. For each test cross you may assume that the female is heterozygous and...
Please help
(2) In Drosophila there are three genes lozenge (z), singed (s), and crossveinless (c), with each mutant allele recessive to the wild type allele. A cross between females heterozygous for these three loci and wild-type males yielded the following progeny: Females1010 Males + 39 430 +Cz 32 s27 C+ 441 SCz 31 Using these data, construct a linkage map (4 points) of the 3 genes and calculate the coefficient of coincidence (2 points) and interference (2 points).
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
vermilion mutation (v) and the autosomal recessive scarlet (s)
mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
Question 3. From text book Male Drosophila expressing the autosomal recessive mutations sc (scute), ec (echinus), cv (crossveinless) and b (black) were crossed to phenotypically wild- type females, and the 3288 progeny listed were obtained. (Only mutant traits are noted.) 653 black, scute, echinus, crossveinless 670 scute, echinus, crossveinless 675 ild type 655 black 71 black, scute 73 scute 73 black, echinus, crossveinless 74 echinus, crossveinless 87 black, scute, echinus 84 scute, echinus 86 black, crossveinless 83 crossveinless 1 lack,...
In Drosophila, the autosomal recessive traits for dumpy wings (dp) and cinnabar eyes (cn) are found on chromosome 2, separated by 44 map units. The allele for shaven bristles (sv) is found on chromosome 4 and is also recessive. A female with shaven. bristles is crossed to a male expressing dumpy wings and cinnabar eyes. FI females are test-crossed to males expressing all three traits. 3. What proportion of F2 flies (of either sex) will be completely wild type? a....
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on the Drosophila X chromosome (a, b, and c). Assume that you are starting out with true-breeding stocks that show all three recessive traits and true-breeding stocks that show all three dominant traits. A. If you wanted to do a 3-point test cross to map the three loci, how would you set up the cross? What genotypes do you use for males and females in...
36. The recessive autosomal maize genes sh and bz are linked and 40 map units apart, If a plant with the genotype sh bz/ sh bz is selfed, what percentage of the progeny will be double recessive? 37. If the recombination frequency between the linked autosomal genes A and B in Drosophila is 15 percent, what phenotypic frequencies would you expect from a cross AB/ab females x AB/ab males? (There is no crossing over in Drosophila males). 38. In the...
43. Genes a and b are X-linked and are located 7 mu apart on the X chromosome of Drosophila. A female of genotype a+ b/a b+ is mated with a wild-type (a+b+/Y). a. What is the probability that one of her sons will be either a+b+ or a b+ in phenotype? b. What is the probability that one of her daughters will be a+b+ in phenotype? 44. Three recessive autosomal mutations in Drosophila: a versus wild-type A. b versus B,...
Genetic Linkage The six genes listed below are all located on Chromosome 2 of Drosophila melanogaster. Your goal is to construct a genetic map of Chromosome 2. That is, determine the order of these genes along chromosome 2 and the map distance in centimorgans between each gene. To complete this task, you will be given the results of a variety of two-point test crosses involving these genes. For each test cross you may assume that the female is heterozygous and...
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