Dumpy flies have short, stubby bodies. A test cross is performed to determine whether this phenotype...
Dumpy flies have short, stubby bodies. A test cross is performed to determine whether this phenotype is the result of a single dominant allele. The following results are obtained for one such cross:
Dumpy offspring 124
Wild type offspring 110
Use the Chi squared test to determine whether or not the results are compatible with the hypothesis of single gene inheritance
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Dumpy flies have short, stubby bodies. A test cross is performed
to determine whether this phenotype...
In Drosophila (fruit flies) the genes how, dumpy and ebony are located on chromosome 3. LOF...
In Drosophila (fruit flies) the genes how, dumpy and ebony are located on chromosome 3. LOF = loss of function. Flies homozygous for a LOF mutation (no gene product made) in ebony have dark black bodies. Flies homozygous for a LOF mutation (no gene product made) in dumpyhave truncated (short) wings. Flies homozygous for a partial LOF mutation (some gene product made but significantly less than normal) in how have wings that will not fold down (held out wings; that's...
In Drosophila (fruit flies) the genes how, dumpy and ebony are located on chromosome 3. LOF...
In Drosophila (fruit flies) the genes how, dumpy and ebony are located on chromosome 3. LOF = loss of function. Flies homozygous for a LOF mutation (no gene product made) in ebony have dark black bodies. Flies homozygous for a LOF mutation (no gene product made) in dumpy have truncated (short) wings. Flies homozygous for a partial LOF mutation (some gene product made but significantly less than normal) in how have wings that will not fold down (held out wings;...
Colorium is an autosomal dominant trait in Nutonian flies (identical to earth fruit flies in every...
Colorium is an autosomal dominant trait in Nutonian flies (identical to earth fruit flies in every way). There are two alleles at this locus: F = Dominant allele; flies with this allele cannot observe the color Fuschia; these flies have the Colorium phenotype. + = Wild type allele; flies who are homozygous for this allele can observe the color Fuschia; these flies do not have the Colorium phenotype. A cross of a true breeding male with Colorium and a true...
2. You cross a homozygous wildtype female Drosophila (fruit fly) with a male that has a black body (bb). You mate two of the F1 (first generation) flies and examine the F2 (second generation) off...
2. You cross a homozygous wildtype female Drosophila (fruit fly) with a male that has a black body (bb). You mate two of the F1 (first generation) flies and examine the F2 (second generation) offspring. The phenotypes can be seen in the table below. a. Draw a pedigree to show the P, F1, and F2 generations. You only need to draw one fly with each phenotype for the F2 generation. seen in this cross. the expected values for a cross...
In Drosophila, red eyes is a wild-type phenotype. Several different genes affect eye color. One allele...
In Drosophila, red eyes is a wild-type phenotype. Several different genes affect eye color. One allele causes purple eyes, and a different allele causes sepia eyes. Both of these are recessive to red eye color. When flies with purple eyes were crossed to flies with sepia eyes, all F1 flies had red eyes. When the F1 offspring were allowed to mate, the F2 flies were as follows: 162 purple eyes 172 sepia eyes 58 purplish sepia eyes 478 red eyes...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b)...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b) causes the wings to develop a blue color, while the dominant allele (b) permits wild-type colorless wings to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established garnet eyes gene (g). You cross a female heterozygous for both genes with a testcross male fly, and...
In this inquiry, you will investigate a variation of the assumption that there are only two...
In this inquiry, you will investigate a variation of the assumption that there are only two alleles per gene. In this exercise, you will cross a purebred horizontally-striped fly with a pure bred vertically-striped fly. F1 results are: F1 Observed Results: 1000 black F1 flies Question #1: Describe the genotypes of the parents? Question #2: Describe the genotype of the F1 offspring. Question #3: What pattern of inheritance seems to be operating here? Now you will cross 2 flies, one...
Pre-lecture lesson 2.12: Linkage and Gene Mapping You are charged with testing whether 2 different genes...
Pre-lecture lesson 2.12: Linkage and Gene Mapping You are charged with testing whether 2 different genes are independently assorting during meiosis in Drosophila melanogaster, the fruit fly The 2 genes you will be observing for this experiment are: Black: a recessive allele of this gene (b) results in a dark body color (somewhat similar to ebony, but a richer dark coloration that is less ashen-colored). The dominant allele for this gone (B) produces wild type body color Vestigial: a recessive...
In Drosophila, b+ is the allele for normal body color and at the same gene b...
In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to black body, vestigial winged flies. The following segregation ratio was observed: Phenotype # Observed Wild Type (normal,...
In Drosophila, the allele dp determines long wings and dp determines short ("dumpy") wings. At a...
In Drosophila, the allele dp determines long wings and dp determines short ("dumpy") wings. At a separate locus e* determines gray body and e determines ebony body. Both loci are autosomal. The original parents were purebred with antagonistic traits, one of the parents had long wings and ebony body. The dihybrid F1 was test crossed with the following result: Long, ebony 151 Long, gray 136 Short, gray 140 Short, ebony 145 Total You want to determine if the data support...
2. You cross a homozygous wildtype female Drosophila (fruit fly) with a male that has a black body (bb). You mate two of the F1 (first generation) flies and examine the F2 (second generation) offspring. The phenotypes can be seen in the table below. a. Draw a pedigree to show the P, F1, and F2 generations. You only need to draw one fly with each phenotype for the F2 generation. seen in this cross. the expected values for a cross...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b) causes the wings to develop a blue color, while the dominant allele (b) permits wild-type colorless wings to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established garnet eyes gene (g). You cross a female heterozygous for both genes with a testcross male fly, and...
In this inquiry, you will investigate a variation of the assumption that there are only two alleles per gene. In this exercise, you will cross a purebred horizontally-striped fly with a pure bred vertically-striped fly. F1 results are: F1 Observed Results: 1000 black F1 flies Question #1: Describe the genotypes of the parents? Question #2: Describe the genotype of the F1 offspring. Question #3: What pattern of inheritance seems to be operating here? Now you will cross 2 flies, one...
Pre-lecture lesson 2.12: Linkage and Gene Mapping You are charged with testing whether 2 different genes are independently assorting during meiosis in Drosophila melanogaster, the fruit fly The 2 genes you will be observing for this experiment are: Black: a recessive allele of this gene (b) results in a dark body color (somewhat similar to ebony, but a richer dark coloration that is less ashen-colored). The dominant allele for this gone (B) produces wild type body color Vestigial: a recessive...
In Drosophila, b+ is the allele for normal body color and at the same gene b is the allele for black body color. A second gene controls wing shape. The shape can be either normal (vg+) or vestigial (vg). A cross is made between a homozygous wild type fly and fly with black body and vestigial wings. The offspring were then mated to black body, vestigial winged flies. The following segregation ratio was observed: Phenotype # Observed Wild Type (normal,...
In Drosophila, the allele dp determines long wings and dp determines short ("dumpy") wings. At a separate locus e* determines gray body and e determines ebony body. Both loci are autosomal. The original parents were purebred with antagonistic traits, one of the parents had long wings and ebony body. The dihybrid F1 was test crossed with the following result: Long, ebony 151 Long, gray 136 Short, gray 140 Short, ebony 145 Total You want to determine if the data support...
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