Drosophila Genetic Mapping
| +++ | 98 |
| abc | 99 |
| ++c | 257 |
| a+c | 217 |
| ab+ | 264 |
| +b+ | 214 |
| a++ | 484 |
| +bc | 477 |
The data set tabulated above presents the results of a testcross using female flies heterozygous for three traits and male flies, which are homozygous recessive. For simplicity, mutant alleles are shown with letters a, b, and c, and wildtype alleles are indicated by a “+” symbol.
Determine the gene order (which gene is in the middle?)
Construct a genetic map for the three genes, including the map distances between them. Clearly indicate the logic you followed and show all your calculations. Include the full distance calculations for the two most distanced genes (do not just add the other 2 distances)
Homework Answers
- Identify parental genotypes.
- Find out the gene order.
- Calculate map distance between the given genes.
- Draw a genetic map including the given genes.
Data Set B presents the results of a testcross using female flies heterzygous for three traits...
Data Set B presents the results of a testcross using female
flies heterzygous for three traits and male flies, which are
homozygous recessive for the same three traits.
Part B Data set B presents the results of a testcross using female flies heterozygous for three traits and male flies, which are homozygous recessive for the same three traits. For this part of the report do the following: a) Attach your data set to your report. b) Clearly indicate parental, SCO...
Data set B presents the results of a testcross using female flies heterozygous for three traits...
Data set B presents the results of a testcross using female
flies heterozygous for three traits and male flies, which are
homozygous recessive for the same three traits. For this part of
the report do the following:You have first to determine the gene
order. Construct a genetic map for these three genes, including the
map distances between them. Clearly indicate the logic you followed
and show all your calculations.
91 504 346 342 343 344 476 79 B5 0 +...
The following is a testcross of females flies heterozygous for three traits and male flies which...
The following is a testcross of females flies heterozygous for three traits and male flies which are homozygous recessive for the same three traits. a b c 451 a + + 172 + b + 171 + + + 459 + b c 180 a + c 178 + + c 96 a b + 92 a) Determine the parental, SCOI, SCOII and DCO classes b) Determine Gene Order c) Rewrite the table with the right gene order d) Calculate...
FIVE. You have identified a new mutant in Drosophila that defines a gene you call “red.” When mutant it causes the “neck” of the fly (cervical connective) to be red. It behaves as an autosomal recessi...
FIVE. You have identified a new mutant in Drosophila that defines a gene you call “red.” When mutant it causes the “neck” of the fly (cervical connective) to be red. It behaves as an autosomal recessive mutation with alleles red+ and red-. You suspect it is linked to two known genes on the second chromosome “re” and “ti”. The re- mutation behaves as an autosomal recessive. Homozygous mutant flies fixate on TV reruns, “re+” normal flies avoid TV. The “ti”...
The genes for sepia eye color, short bristles, and dark body coloration are on the same...
The genes for sepia eye color, short bristles, and dark body coloration are on the same chromosome of Drosophila melanogaster. Each gene has two alleles: wild type, which is dominant, or mutant, which is recessive. se+ is dominant and causes red eyes; se is recessive and causes sepia eyes sb+ is dominant and causes long bristles; sb is recessive and causes short bristles b+ is dominant and causes gray body coloration; b is recessive and causes dark...
please help me!!! 5.) You have discovered mutants in two new gene mutants in Drosophila. One...
please help me!!!
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three...
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has...
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three cases, these mutant...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver, qu, and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding quiver is linked to the recessive gene for vestigial wings, vg. She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits, and then uses the resulting F1 females...
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, a fully hetero sophila, a fully heterozygous female with the X-linked recessive genes a...
In Drosophila, a fully hetero sophila, a fully heterozygous female with the X-linked recessive genes a bande not necessarily in that order on the chromosome) was mated to ma c(not necessarily in that order on the chromosom in that order on the chromosome). The offspring occurred in the following phenotypic ratios: Phenotypes Numbers wildtype ac,b 426 428 cb b, a c, a Total 1000 a) What is the arrangement among the genes? Which gene is in the middle? b) What...
Data Set B presents the results of a testcross using female
flies heterzygous for three traits and male flies, which are
homozygous recessive for the same three traits.
Part B Data set B presents the results of a testcross using female flies heterozygous for three traits and male flies, which are homozygous recessive for the same three traits. For this part of the report do the following: a) Attach your data set to your report. b) Clearly indicate parental, SCO...
Data set B presents the results of a testcross using female
flies heterozygous for three traits and male flies, which are
homozygous recessive for the same three traits. For this part of
the report do the following:You have first to determine the gene
order. Construct a genetic map for these three genes, including the
map distances between them. Clearly indicate the logic you followed
and show all your calculations.
91 504 346 342 343 344 476 79 B5 0 +...
please help me!!!
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three...
5.) You have discovered mutants in two new gene mutants in Drosophila. One mutant, curl, has small, curly, nonfunctional wings. The other mutant, big, has enormous eyes. You decide to test if these two new genes are on chromosome #2, so you perform a three-gene linkage testcross using a gene that you know is on chromosome #2, trp, a mutant that cannot make its own tryptophan (and so must get it from its food). In all three cases, these mutant...
Suppose that a geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver, qu, and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding quiver is linked to the recessive gene for vestigial wings, vg. She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits, and then uses the resulting F1 females...
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, a fully hetero sophila, a fully heterozygous female with the X-linked recessive genes a bande not necessarily in that order on the chromosome) was mated to ma c(not necessarily in that order on the chromosom in that order on the chromosome). The offspring occurred in the following phenotypic ratios: Phenotypes Numbers wildtype ac,b 426 428 cb b, a c, a Total 1000 a) What is the arrangement among the genes? Which gene is in the middle? b) What...
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