Homework Answers
the closer together two markers are the more frequently they will be co-inherited by generalized transduction; if two markers are too far apart to be packaged in the same transducing particle then they will never be co-inherited by generalized transduction. so frequency of co transdution would be 0.5.
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If two bacterial genes are 0.5 minutes apart on the bacterial chromosome, what frequency of cotransductants...
5. In humans, if two genes are 28 CM apart on the same chromosome, what percentage...
5. In humans, if two genes are 28 CM apart on the same chromosome, what percentage of gametes would you expect to be recombinant with respect to these two genes? Show your work. (9 points)
The B and N genes are 25 map units apart on a chromosome. a) Following a...
The B and N genes are 25 map units apart on a chromosome. a) Following a dihybrid testcross, how many offspring of 250 would you expect to display a recombinant phenotype? a) If you performed a dihybrid testcross, with a cis dihybrid, what would be the genotypes of both recombinant offspring phenotypic classes?
When determining map distance between two genes that are far apart on the same chromosome, it...
When determining map distance between two genes that are far apart on the same chromosome, it is most accurate to add up the recombination frequencies of genes between the two outside genes because The recombination frequency between the two outside genes will be an over-estimate of the actual distance due to double cross-overs By adding up the smaller distances you can account for MANY of the double cross-overs that occurred between the two closest genes. By adding up the smaller...
QUESTION 4 Two genes on the same chromosome exhibit a recombination rater of 0.5. What can...
QUESTION 4 Two genes on the same chromosome exhibit a recombination rater of 0.5. What can be said about the linkage of these two genes? They are physically linked They are genetically linked They are unlinked They are both physically and genetically linked.
You have created a mutant that is streptomycin resistant (s+), has the ability to photosynthesize (p+), and is resistant...
You have created a mutant that is streptomycin resistant (s+),
has the ability to photosynthesize (p+), and is resistant to a
particular phage, P5 (r+). Your PI would like you to try and move
these traits into E. coli by means of generalized transduction.The
donor phage has the genotype s+ p+ r+, while the recipient
bacterium has the genotype s- p- r-. You carry out selection for
the phage resistance trait and then screen all of the r+
transductants for...
Two genes, A and B, are 64 cM apart on a chromosome. How can we measure...
Two genes, A and B, are 64 cM apart on a chromosome. How can we measure the genetic distance between A and B? In a test cross between a double heterozygote and a homozygous recessive individual, we should observe 64% recombinant progeny If gene C lies between A and B, we can measure the recombination rate between A-C and C-B. Both of the above will work There is no way to measure genetic distance greater than 50 cM. I know...
You see a recombination frequency of 0.0313%), what does this indicate? That the genes are located...
You see a recombination frequency of 0.0313%), what does this indicate? That the genes are located close together on the same chromosome That the offspring has a large number of non-parental phenotypes That the genes are on different chromosomes That the genes are assorting independently That the genes are located on the same chromosome, but very far apart
Three genes are located on the same chromosome and are known to be 8 mu apart...
Three genes are located on the same chromosome and are known to be 8 mu apart between A and B, and 12 mu apart between B and C. The heterozygous AaBbCc genotype individuals were crossed to homozygous recessive aabbcc genotype individuals (test cross) and observed 3 double crossover offsprings. If this cross produces a total of 500 offsprings, what are the expected numbers of double crossover offsprings and calculate the Interference (1) value. (3 points) 4·
In Drosophila, genes a and b are located at positions 22.0 and 42.0 on chromosome 2, and genes c ...
Explain how the positioning is used to calculate proportion.
In Drosophila, genes a and b are located at positions 22.0 and 42.0 on chromosome 2, and genes c and d are located at positions 10.0 and 25.0 on chromosome 3 A fly homozygous for the wild-type alleles of these four genes was crossed with a fly homozygous for the reces- sive alleles, and the F, daughters were backcrossed to their quadruply recessive fathers. What offspring would you expect from this...
In flamingos, genes A and B are known to be 21 map units apart on chromosome...
In flamingos, genes A and B are known to be 21 map units apart on chromosome #5. You mate an AA:BB male with an aa:bb female to produce F1 flamingos. a. What gametes will be made by these F1 individuals and in what proportions? b. When the F1's are bred to each other, they produce a total of 276 offspring. How many of these offspring would you predict should have the genotype Aa:BB?
5. In humans, if two genes are 28 CM apart on the same chromosome, what percentage of gametes would you expect to be recombinant with respect to these two genes? Show your work. (9 points)
The B and N genes are 25 map units apart on a chromosome. a) Following a dihybrid testcross, how many offspring of 250 would you expect to display a recombinant phenotype? a) If you performed a dihybrid testcross, with a cis dihybrid, what would be the genotypes of both recombinant offspring phenotypic classes?
QUESTION 4 Two genes on the same chromosome exhibit a recombination rater of 0.5. What can be said about the linkage of these two genes? They are physically linked They are genetically linked They are unlinked They are both physically and genetically linked.
You have created a mutant that is streptomycin resistant (s+),
has the ability to photosynthesize (p+), and is resistant to a
particular phage, P5 (r+). Your PI would like you to try and move
these traits into E. coli by means of generalized transduction.The
donor phage has the genotype s+ p+ r+, while the recipient
bacterium has the genotype s- p- r-. You carry out selection for
the phage resistance trait and then screen all of the r+
transductants for...
You see a recombination frequency of 0.0313%), what does this indicate? That the genes are located close together on the same chromosome That the offspring has a large number of non-parental phenotypes That the genes are on different chromosomes That the genes are assorting independently That the genes are located on the same chromosome, but very far apart
Three genes are located on the same chromosome and are known to be 8 mu apart between A and B, and 12 mu apart between B and C. The heterozygous AaBbCc genotype individuals were crossed to homozygous recessive aabbcc genotype individuals (test cross) and observed 3 double crossover offsprings. If this cross produces a total of 500 offsprings, what are the expected numbers of double crossover offsprings and calculate the Interference (1) value. (3 points) 4·
Explain how the positioning is used to calculate proportion.
In Drosophila, genes a and b are located at positions 22.0 and 42.0 on chromosome 2, and genes c and d are located at positions 10.0 and 25.0 on chromosome 3 A fly homozygous for the wild-type alleles of these four genes was crossed with a fly homozygous for the reces- sive alleles, and the F, daughters were backcrossed to their quadruply recessive fathers. What offspring would you expect from this...
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