In C. elegans, lon-2 and unc-2 are recessive mutations that are 8 map units apart on...
In C. elegans, lon-2 and unc-2 are recessive mutations that are 8 map units apart on the X chromosome. A hermaphrodite who is Lon and Unc is mated to a wild-type male. An F1 hermaphrodite is mated to a wild-type male. What are the expected percentages of the different phenotypes among the male progeny?
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In C. elegans, lon-2 and unc-2 are recessive mutations that are
8 map units apart on...
A wild-type male mates with a hermaphrodite that is both unusually long (lon) and has uncoordinated...
A wild-type male mates with a hermaphrodite that is both unusually long (lon) and has uncoordinated (unc) movement. All of the F, male offspring are long but with normal movement, while all of the F, hermaphrodite offspring are normal in both body length and movement. a. What can you determine about the linkage or chromosomal locations of the lon and the unc genes? among the cross-progeny in the F, generation, and in what proportions? expected in the F, generation, and...
717 pts). In Drosophila, two recessive mutations delta vein (d) and rough eye (r) both map...
717 pts). In Drosophila, two recessive mutations delta vein (d) and rough eye (r) both map to chromosome 3 and are known to be 20 m.u. apart. Another recessive mutation, garnet eye color (a) has been mapped to the X chromosome. A delta veined, rough and garnet eyed- female was crossed to a wild-type male. The resulting fī females are testcrossed to delta-veined, rough and, garnet-eyed males. dng larg & ORG/ A. (6pts) Write the genotype of the Fı female...
"Ebony body, held-out wings and sepia eyes are ALL RECESSIVE AND ALL ON CHROMOSOME 3. The...
"Ebony body, held-out wings and sepia eyes are ALL RECESSIVE AND ALL ON CHROMOSOME 3. The COEFFICIENT of COINCIDENCE for chromosome 3 is 0.5. A homozygous ebony male is mated to a homozygous held out wing and sepia eyed female. The F1 are wild-type. An F1 female is test crossed to a fly that is homozygous for all three recessive alleles and they produce 1000 progeny. If ebony and held-out are separated by 12 map units, and held-out and sepia...
1. In Drosophilia, females are XX, while males are XY. Yellow bodies are determined by an...
1. In Drosophilia, females are XX, while males are XY. Yellow bodies are determined by an X-linked recessive mutation Xb, while the dominant wild-type allele XB produces brown bodies. A heterozygous female is crossed with a brown bodied male to produce the F1 generation. a) Among the F1 generation, what genotypes and phenotypes would be expected among the progeny, and in what proportion? b) from the F1 generation, males and females are mated at random. What genotypes and phenotypes would...
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...
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...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait; b is associated with buckled wings; and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as the following results. From this data, calculate the map distance between a and...
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,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, bis associated with buckled wings, and is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. Which gene is in the middle? Testcross progeny phenotype Number curved 277 anomalous, buckled...
The following pertains to questions 1-2. Let's say you EMS treat C. elegans, scan for interesting phenotypes, and pick an adult hermaphrodite with an unusually long body. The long body pheno...
The following pertains to questions 1-2. Let's say you EMS treat C. elegans, scan for interesting phenotypes, and pick an adult hermaphrodite with an unusually long body. The long body phenotype is referred to as Lon. You establish a homozygous true breeding Lon mutant strain and name it lon-9. Through crosses you discover that the lon-9 mutant allele is recessive. Let's say you work out that the lon-9 gene is X-linked. Ion-2 is an X-linked gene and the Ion-2(e432) allele...
A wild-type male mates with a hermaphrodite that is both unusually long (lon) and has uncoordinated (unc) movement. All of the F, male offspring are long but with normal movement, while all of the F, hermaphrodite offspring are normal in both body length and movement. a. What can you determine about the linkage or chromosomal locations of the lon and the unc genes? among the cross-progeny in the F, generation, and in what proportions? expected in the F, generation, and...
717 pts). In Drosophila, two recessive mutations delta vein (d) and rough eye (r) both map to chromosome 3 and are known to be 20 m.u. apart. Another recessive mutation, garnet eye color (a) has been mapped to the X chromosome. A delta veined, rough and garnet eyed- female was crossed to a wild-type male. The resulting fī females are testcrossed to delta-veined, rough and, garnet-eyed males. dng larg & ORG/ A. (6pts) Write the genotype of the Fı female...
"Ebony body, held-out wings and sepia eyes are ALL RECESSIVE AND ALL ON CHROMOSOME 3. The COEFFICIENT of COINCIDENCE for chromosome 3 is 0.5. A homozygous ebony male is mated to a homozygous held out wing and sepia eyed female. The F1 are wild-type. An F1 female is test crossed to a fly that is homozygous for all three recessive alleles and they produce 1000 progeny. If ebony and held-out are separated by 12 map units, and held-out and sepia...
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...
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...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait; b is associated with buckled wings; and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as the following results. From this data, calculate the map distance between a and...
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,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, bis associated with buckled wings, and is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. Which gene is in the middle? Testcross progeny phenotype Number curved 277 anomalous, buckled...
The following pertains to questions 1-2. Let's say you EMS treat C. elegans, scan for interesting phenotypes, and pick an adult hermaphrodite with an unusually long body. The long body phenotype is referred to as Lon. You establish a homozygous true breeding Lon mutant strain and name it lon-9. Through crosses you discover that the lon-9 mutant allele is recessive. Let's say you work out that the lon-9 gene is X-linked. Ion-2 is an X-linked gene and the Ion-2(e432) allele...
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