Provide an explanation
Three genes are linked: a---------------20----------------b----------10------------c
In a trihybrid test cross, from which 1000 offspring are counted, how many double crossover offspring are expected if there is no crossover interference?
How many would be expected if there was 20% (0.20) crossover interference?
Question 8
A geneticist collects three-point test cross data to map three genes as follows: -----20----------------b--------10-------- c
In the test cross data, a total of 18 double crossover offspring were collected out of 1000 progeny.
What is the number of DCO offspring that would be expected out of the 1000 progeny given the map?
Calculate the Coefficient of Coincidence:
Homework Answers
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In a trihybrid test cross, from which 1000 offspring are counted, how many double crossover offspring are expected if there is no crossover interference?
im not sure how to calcualte the double crossover offspring A cross in Drosophila involved the...
im not sure how to calcualte the double crossover
offspring
A cross in Drosophila involved the recessive, X-linked genes yollow (y), white (w), and cut (ch). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut • The F, females were wild type for all three traits. The F, males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male...
By analyzing the gametes from a trihybrid fruit fly that is heterozygous for three linked genes...
By analyzing the gametes from a trihybrid fruit fly that is heterozygous for three linked genes (AaBbDd), you obtain the following data: Organize the 8 haploid genotypes into pairs that correspond to parentals, double crossovers (DCO) and each of the two types of single crossovers (SCO). Draw a map showing the order of the three genes on the chromosome. Label the map to indicate the distances (in centimorgans or map-units) between the gene in the middle and the genes on...
please solve qs12-23 and include explanations thanks A wild-type trihybrid soybean plant Phenotype Number is crossed...
please solve qs12-23 and include explanations thanks
A wild-type trihybrid soybean plant Phenotype Number is crossed to a pure-breeding Pale 648 soybean plant with the recessive Pale, oval phenotypes pale leaf (), oval seed Pale, short 10 (r), and short height (t). The results Pale, oval, short 102 of the three-point test cross are Oval shown in the table. Traits not listed Oval, short 618 are wild-type. Short 84 Wild type 98 1. True False The phenotypes 1630 listed in...
1. A genetic cross in which the inheritance of two traits is observed is called a...
1. A genetic cross in which the inheritance of two traits is observed is called a A) Dihybrid cross. B) Monohybrid cross C) Backeross D) Testcross 2. For single crossovers, the frequency of recombinant gametes is half the frequency of crossing over because A) A testeross between a homozygous and heterozygote produces 1/2 heterozygous and 1/2 homozygous progeny. B) The frequency of recombination is always 50%. C) Each crossover takes place between only two of the four chromatids of a...
genetics-gene mapping Question 6 1 pts You identified 3 genes (A, B and C) located in...
genetics-gene mapping
Question 6 1 pts You identified 3 genes (A, B and C) located in the third chromosome of the Arabidopsis plant. After many crosses you determine the following genetic distances: A - 30- MU - B - 20 MU -C Out of the 500 hundred three point cross progeny you have found 10 double cross plants. Is there genetic interference happening? What is the coefficient of coincidence? I = 1 - c.o.c where c.o.c. = (observed DCO)/(expected DCO)...
Which of the following are not mechanisms that regulate transcription? How/Why is E the answer?? A)...
Which of the following are not mechanisms that regulate transcription? How/Why is E the answer?? A) The stimulation of a signal transdusction pathway by a hormone that ultimately causes the activation of very specific transcription factors. B) The formation of a protein bridge between a silencer and the promoter complex. C) The formation of a protein bridge between an enhancer and the promoter complex. D) The availability of transcription factors that bind to the promoter. E) The addition of the...
Consider the progeny data attached from a test cross. Using the expected number of progeny that...
Consider the progeny data attached from a test cross. Using the expected number of progeny that are double crossovers based on this data, and given an interference value of –0.18, how may double cross-over progeny should be observed? Enter a number rounded to the nearest integer. Phenotype # progeny {m,b,+} 496 {b,a,m} 27 {b,+,+} 555 {b,a,+} 1312 {+,a,+} 549 {+,+,+} 24 {+,m,+} 1296 {a,+,m} 504
You sample a number of cells that have undergone meiosis looking for the production of recombinants...
You sample a number of cells that have undergone meiosis looking for the production of recombinants between the genes ec, vg, and s. You find 10 cells with no crossovers between ec and s. 30 with 1 crossover between ec ands, 10 with 2 crossovers between ec and s, and zero with three or more crossovers. What is the map distance between the genes ec and s? 1.2 CM 0.8 CM 0.6 CM 0.2 CM 1.0 CM In a data...
In mice, genes for albinism (a), chronic, inflammation (i), and reduced sense of smell (r) are...
In mice, genes for albinism (a), chronic, inflammation (i), and reduced sense of smell (r) are linked. You initially crossed a mouse that is homozygous dominant for all three traits with a mouse that is homozygous recessive for all three traits. You then crossed several of the resulting F_1 offspring to mice that are homozygous recessive for all three traits. You observe the following phenotypes in the offspring: Diagram a map between the genes and calculate the map distances. If...
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...
im not sure how to calcualte the double crossover
offspring
A cross in Drosophila involved the recessive, X-linked genes yollow (y), white (w), and cut (ch). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut • The F, females were wild type for all three traits. The F, males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male...
By analyzing the gametes from a trihybrid fruit fly that is heterozygous for three linked genes (AaBbDd), you obtain the following data: Organize the 8 haploid genotypes into pairs that correspond to parentals, double crossovers (DCO) and each of the two types of single crossovers (SCO). Draw a map showing the order of the three genes on the chromosome. Label the map to indicate the distances (in centimorgans or map-units) between the gene in the middle and the genes on...
please solve qs12-23 and include explanations thanks
A wild-type trihybrid soybean plant Phenotype Number is crossed to a pure-breeding Pale 648 soybean plant with the recessive Pale, oval phenotypes pale leaf (), oval seed Pale, short 10 (r), and short height (t). The results Pale, oval, short 102 of the three-point test cross are Oval shown in the table. Traits not listed Oval, short 618 are wild-type. Short 84 Wild type 98 1. True False The phenotypes 1630 listed in...
1. A genetic cross in which the inheritance of two traits is observed is called a A) Dihybrid cross. B) Monohybrid cross C) Backeross D) Testcross 2. For single crossovers, the frequency of recombinant gametes is half the frequency of crossing over because A) A testeross between a homozygous and heterozygote produces 1/2 heterozygous and 1/2 homozygous progeny. B) The frequency of recombination is always 50%. C) Each crossover takes place between only two of the four chromatids of a...
genetics-gene mapping
Question 6 1 pts You identified 3 genes (A, B and C) located in the third chromosome of the Arabidopsis plant. After many crosses you determine the following genetic distances: A - 30- MU - B - 20 MU -C Out of the 500 hundred three point cross progeny you have found 10 double cross plants. Is there genetic interference happening? What is the coefficient of coincidence? I = 1 - c.o.c where c.o.c. = (observed DCO)/(expected DCO)...
You sample a number of cells that have undergone meiosis looking for the production of recombinants between the genes ec, vg, and s. You find 10 cells with no crossovers between ec and s. 30 with 1 crossover between ec ands, 10 with 2 crossovers between ec and s, and zero with three or more crossovers. What is the map distance between the genes ec and s? 1.2 CM 0.8 CM 0.6 CM 0.2 CM 1.0 CM In a data...
In mice, genes for albinism (a), chronic, inflammation (i), and reduced sense of smell (r) are linked. You initially crossed a mouse that is homozygous dominant for all three traits with a mouse that is homozygous recessive for all three traits. You then crossed several of the resulting F_1 offspring to mice that are homozygous recessive for all three traits. You observe the following phenotypes in the offspring: Diagram a map between the genes and calculate the map distances. If...
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...
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