Gene mapping D and J are genes, each with 2 alleles. A testcross between a heterozygote...
Gene mapping
D and J are genes, each with 2 alleles. A testcross between a heterozygote individual and homozygous recessive individual is performed and the following progeny are observed:
D__ J__ 52
D__ jj 46
dd J__ 48
dd jj 54
Suppose D and J are in fact linked, now consider another 2 loci P and Q, each with 2 alleles, and 2 point testcrosses for genes Q and J, P and J, then D and P are performed.
P__ J__ 40
P__ jj 10
pp J__ 10
pp jj 40
Q__ J__ 46
Q__ jj 2
qq J__ 3
qq jj 49
D__ P__ 104
D__ pp 92
dd P__ 96
dd pp 108
Map D, J, P, Q.
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Gene mapping
D and J are genes, each with 2 alleles. A testcross between a
heterozygote...
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...
Mapping genes with recombination frequencies in Drosopna 1. Suppose you know of three linked loci on...
Mapping genes with recombination frequencies in Drosopna 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,...
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...
A testcross with a heterozygote b+bc+c produces a total of 700 offspring. The following are the...
A testcross with a heterozygote b+bc+c produces a total of 700 offspring. The following are the resulting phenotypes of the progeny and corresponding numbers: b+c+ = 270; bc = 255; b+c=83; bc+=92 1) Based on the data, do the genes b and c appear to be linked or are they assorting independently? How did you determine your answer? If the genes are linked, which of the above genotypes are the non-recombinant progeny? Also, is the original configuration of the loci...
Two genes with two alleles each are 30 centimorgans (map units) apart. A double heterozygote is...
Two genes with two alleles each are 30 centimorgans (map units) apart. A double heterozygote is crossed to a double homozygote. What frequency in the progeny will be double homozygotes? Select one: a. 30 percent b. 35 percent c. 15 percent d. 70 percent e. O percent
31. ANALYSIS Priscilla Lane and Margaret Green studied the linkage relations of three genes affecting coat...
31. ANALYSIS Priscilla Lane and Margaret Green studied the linkage relations of three genes affecting coat color in mice: mahogany (mg), agouti (a), and ragged (Rg). They carried out a series of three-point crosses, mating mice that were heterozygous at all three loci with mice that were homozygous for the recessive alleles at these loci (P W. Lane and M. C. Green. 1960. Journal of Heredity 51:228-230). The following table lists the results of the testcrosses. Number Phenotype Rg 1...
2. In a testcross of a female Drosophila heterozygous for three linked recessive genes, the following...
2. In a testcross of a female Drosophila heterozygous for three linked recessive genes, the following phenotypes of progeny were obtained: 442 435 at bt d a bd at bd a bt d at bd a bt di at bt dt a bd Total ONEN 1000 A) Write out the parental genotype of the heterozygous parent indicating the correct allele configuration and gene order B) Construct a map of the genes and indicate the map-distances based on the data shown...
16.) [16 pts Consider linked genes s, t, and u in an organism. The s, t,...
16.) [16 pts Consider linked genes s, t, and u in an organism. The s, t, and u alleles are recessive to wild type. An Fl triple heterozygote for these genes is test-crossed. Testcross progeny are in the following phenotypic classes: p sutt + + + SU + 352 + u + ( U + 34 + 5 Sut (sl sut as + I SC S7+ 45 so she is 96 + + t S + t S + +...
There are two alleles for the arr gene, A and a. There are also two alleles...
There are two alleles for the arr gene, A and a. There are also two alleles for bee gene, B and b. The two genes are on a chromosome that is 1.5 micrometers in length, but it has yet to be determined if the two genes are linked. Below is data from a study to determine if the genes are linked, and if so, how far apart the genes are on the chromosome. An organism that is heterozygous for both...
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...
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...
Mapping genes with recombination frequencies in Drosopna 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...
Two genes with two alleles each are 30 centimorgans (map units) apart. A double heterozygote is crossed to a double homozygote. What frequency in the progeny will be double homozygotes? Select one: a. 30 percent b. 35 percent c. 15 percent d. 70 percent e. O percent
31. ANALYSIS Priscilla Lane and Margaret Green studied the linkage relations of three genes affecting coat color in mice: mahogany (mg), agouti (a), and ragged (Rg). They carried out a series of three-point crosses, mating mice that were heterozygous at all three loci with mice that were homozygous for the recessive alleles at these loci (P W. Lane and M. C. Green. 1960. Journal of Heredity 51:228-230). The following table lists the results of the testcrosses. Number Phenotype Rg 1...
2. In a testcross of a female Drosophila heterozygous for three linked recessive genes, the following phenotypes of progeny were obtained: 442 435 at bt d a bd at bd a bt d at bd a bt di at bt dt a bd Total ONEN 1000 A) Write out the parental genotype of the heterozygous parent indicating the correct allele configuration and gene order B) Construct a map of the genes and indicate the map-distances based on the data shown...
16.) [16 pts Consider linked genes s, t, and u in an organism. The s, t, and u alleles are recessive to wild type. An Fl triple heterozygote for these genes is test-crossed. Testcross progeny are in the following phenotypic classes: p sutt + + + SU + 352 + u + ( U + 34 + 5 Sut (sl sut as + I SC S7+ 45 so she is 96 + + t S + t S + +...
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...
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