Homework Answers
Linkage and recombination are phenomena that describe the inheritance of genes. A linkage is a phenomenon where two or more linked genes are always inherited together in the same combination for more than two generations. The recombination frequency of the test cross progeny is always lower than 50%. Therefore, if any two genes are completely linked, their recombination frequency is almost 0%. The phenomenon of linkage was studied by the scientist T.H. Morgan using the common fruit fly or Drosophila melanogaster.
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33. (8 points) A graduate student in your laboratory has just heard of a proposal by...
BIO340 Recitation 5 Spring 2020 Your professor is having you look at two genes in Drosophila...
BIO340 Recitation 5 Spring 2020 Your professor is having you look at two genes in Drosophila fruit flies to determine experimentally whether they are linked. One trait is eye color and two alleles are present at the gene: se+ is the wild-type allele for red eyes, and se is the mutant, recessive allele for sepia eyes. The second trait is body color and two alleles are present at this gene: e+ is the wild-type allele for grey body, and e...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (1) are recessive to wild type bristles (fº). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (f) are recessive to wild type bristles (f+). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes and is recessive to the wildtype red eye color (v+). An allele y of the yellow gene, gives flies a yellow body color compared to the dominant brown body color (yt). A heterozygous females for the two different mutations is test-crossed with mutant (i.e., homozygous recessive) males. The phenotypes of the progeny of this cross and their corresponding numbers are given below Yellow body,...
5. You started working in a Drospohila lab. You are studying two different autosomal traits, body...
5. You started working in a Drospohila lab. You are studying two different autosomal traits, body color and antennae length. Gray body (B) is completely dominant to black body (b) and long antennae length (A) is completely dominant to short antennae length (a). You cross true-breeding gray bodied, long antennae files to true-breeding black bodied, short antennae. The F1 progeny all have gray bodies and long antennae. a. You perform a testcross to the F1 progeny produced from the parent...
6. (7 points) Dr. O. Sophila is a famous geneticist who studies recombination of genes in...
6. (7 points) Dr. O. Sophila is a famous geneticist who studies recombination of genes in fruit flies. She is studying the relationship between a gene vermillion (v) that gives flies purple eyes and is recessive to the wildtype red eye color (vt) and the gene yellow (y) that gives flies a yellow body color compared to the dominant brown body color (y) Dr. Sophila has generated females heterozygous for the two different mutations and performs a testcross with mutant...
1. Four eye-color variants in Drosophila- brown, carnation, apricot, and purple - are inherited as recessive...
1. Four eye-color variants in Drosophila- brown, carnation, apricot, and purple - are inherited as recessive traits. Red is the dominant wild-type color. Eight crosses are made between parents of pure-breeding lines. Which of these traits are inherited as X-linked and which are autosomal? Explain how you distinguish between X-inked and autosomal inheritance. a. b. Predict the F2 ratios of crosses between the F1 progeny in A, B, D, and G Cross Parents F1 Progeny FemaleMale Red Red Red Red...
(blue and red of the wild type pathways shown 5.(9.5 points) Hagrid has introduced a new...
(blue and red of the wild type pathways shown 5.(9.5 points) Hagrid has introduced a new course at Hogwarts: Genetics of a Through their experiments, the fifth years have discovered that flobberw in years have discovered that flobberworms are normally purple, with pigmentation controlled by mixing the end products (blue and red of the wild type below). Through genetic experiments, they've discovered that the step su genetic experiments, they've discovered that the steps of the pathways are controlled by 3...
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...
Questions 34 to 41 deal with linkage and mapping: see Sanders & Bowman 2015/2018 - Chapter...
Questions 34 to 41 deal with linkage and mapping: see Sanders & Bowman 2015/2018 - Chapter 5. 34. Two true-breeding Drosophila were crossed: a normal-winged, normal-bodied female and a curved-winged, speck-bodied male. The F, all have normal wings and normal bodies. Female F1 offspring were then crossed with curved-winged, speck- bodied male flies. The following offspring of that cross were counted: 174 normal wings, normal body (Neither the allele for curved wings nor 169 curved wings, speck body that for...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (1) are recessive to wild type bristles (fº). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (f) are recessive to wild type bristles (f+). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes and is recessive to the wildtype red eye color (v+). An allele y of the yellow gene, gives flies a yellow body color compared to the dominant brown body color (yt). A heterozygous females for the two different mutations is test-crossed with mutant (i.e., homozygous recessive) males. The phenotypes of the progeny of this cross and their corresponding numbers are given below Yellow body,...
5. You started working in a Drospohila lab. You are studying two different autosomal traits, body color and antennae length. Gray body (B) is completely dominant to black body (b) and long antennae length (A) is completely dominant to short antennae length (a). You cross true-breeding gray bodied, long antennae files to true-breeding black bodied, short antennae. The F1 progeny all have gray bodies and long antennae. a. You perform a testcross to the F1 progeny produced from the parent...
6. (7 points) Dr. O. Sophila is a famous geneticist who studies recombination of genes in fruit flies. She is studying the relationship between a gene vermillion (v) that gives flies purple eyes and is recessive to the wildtype red eye color (vt) and the gene yellow (y) that gives flies a yellow body color compared to the dominant brown body color (y) Dr. Sophila has generated females heterozygous for the two different mutations and performs a testcross with mutant...
1. Four eye-color variants in Drosophila- brown, carnation, apricot, and purple - are inherited as recessive traits. Red is the dominant wild-type color. Eight crosses are made between parents of pure-breeding lines. Which of these traits are inherited as X-linked and which are autosomal? Explain how you distinguish between X-inked and autosomal inheritance. a. b. Predict the F2 ratios of crosses between the F1 progeny in A, B, D, and G Cross Parents F1 Progeny FemaleMale Red Red Red Red...
(blue and red of the wild type pathways shown 5.(9.5 points) Hagrid has introduced a new course at Hogwarts: Genetics of a Through their experiments, the fifth years have discovered that flobberw in years have discovered that flobberworms are normally purple, with pigmentation controlled by mixing the end products (blue and red of the wild type below). Through genetic experiments, they've discovered that the step su genetic experiments, they've discovered that the steps of the pathways are controlled by 3...
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...
Questions 34 to 41 deal with linkage and mapping: see Sanders & Bowman 2015/2018 - Chapter 5. 34. Two true-breeding Drosophila were crossed: a normal-winged, normal-bodied female and a curved-winged, speck-bodied male. The F, all have normal wings and normal bodies. Female F1 offspring were then crossed with curved-winged, speck- bodied male flies. The following offspring of that cross were counted: 174 normal wings, normal body (Neither the allele for curved wings nor 169 curved wings, speck body that for...
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