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
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The recombination frequency between the two outside genes will be an over-estimate of the actual distance due to double cross-overs |
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By adding up the smaller distances you can account for MANY of the double cross-overs that occurred between the two closest genes. |
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By adding up the smaller distances you can account for MANY of the double cross-overs that occurred between the two outside genes. |
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By adding up the smaller distances you can account for some of the parentals, which will look like recombinants when using the two outside genes. |
Homework Answers
Answer:-option a) is correct ----- The recombination frequency between the two genes is the estimate of the actual distance due to double cross over ..................
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When determining map distance between two genes that are far
apart on the same chromosome, it...
The recombination distance between two genes is 30 map units. Are the two genes on the...
The recombination distance between two genes is 30 map units. Are the two genes on the same chromosome? How do you know?
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...
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...
Below is a map of the Drosophila melanogaster X chromosome, giving the distances between adjacent genes...
Below is a map of the Drosophila melanogaster X
chromosome, giving the distances between adjacent genes in cM.
Suppose that a female is heterozygous for an inversion of the
exact entire region from v to wy.
She is also heterozygous for all the genes shown in the map, and
is test-crossed.
What percentage of her progeny will be recombinants between the
following gene pairs?
a) wy and g ___________
b) v and g _____________
12. What is a map unit? Choose the best answer The physical distance between 2 genes...
12. What is a map unit? Choose the best answer The physical distance between 2 genes on a chromosome, measured in the number of nucleotides (base pairs) between the 2 genes. The distance between 2 genes on a sa le chromosome measured by the % of recombinant-type gametes produced by many individuals e nes) of the same genotype, this is the same as the % of ,ecombinant-type offspring produced in a cross or a double heterozypote with an individual hom...
The recombination distance between two genes is 50 map units. What can you say about the...
The recombination distance between two genes is 50 map units. What can you say about the chromosomal locations of these two genes? Explain your answer.
Which of these statements is incorrect? Syntenic genes are located on the same chromosome. Independent assortment...
Which of these statements is incorrect? Syntenic genes are located on the same chromosome. Independent assortment results in recombinant chromosomes. You can reliably predict the relative genetic distance from genes’ physical distance on a chromosome. Linked genes are always syntenic. What is the relative genetic distance between two linked genes if the recombination frequency is 0.49? 0.49 cM 4.9 cM 49 cM 490 cM What statement best explains the distortion in Mendelian ratios observed by Bateson & Punnett in 1905?...
1. 2. 13. Which statement explains why the recombination frequency between two genes is always less...
1.
2.
13.
Which statement explains why the recombination frequency between two genes is always less than 50%? Recombination cannot be more than 50% because chromosomes are only 50 map units in length. The genotype of the F, gametes will always be 50% parental gametes and 50% recombinant gametes. Genes with a recombination frequency near 50% are unlinked and have an equal likelihood of being inherited together or separately. F1 gametes always have 50% of their alleles from each parental...
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·
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?
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...
Below is a map of the Drosophila melanogaster X
chromosome, giving the distances between adjacent genes in cM.
Suppose that a female is heterozygous for an inversion of the
exact entire region from v to wy.
She is also heterozygous for all the genes shown in the map, and
is test-crossed.
What percentage of her progeny will be recombinants between the
following gene pairs?
a) wy and g ___________
b) v and g _____________
12. What is a map unit? Choose the best answer The physical distance between 2 genes on a chromosome, measured in the number of nucleotides (base pairs) between the 2 genes. The distance between 2 genes on a sa le chromosome measured by the % of recombinant-type gametes produced by many individuals e nes) of the same genotype, this is the same as the % of ,ecombinant-type offspring produced in a cross or a double heterozypote with an individual hom...
1.
2.
13.
Which statement explains why the recombination frequency between two genes is always less than 50%? Recombination cannot be more than 50% because chromosomes are only 50 map units in length. The genotype of the F, gametes will always be 50% parental gametes and 50% recombinant gametes. Genes with a recombination frequency near 50% are unlinked and have an equal likelihood of being inherited together or separately. F1 gametes always have 50% of their alleles from each parental...
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·
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?
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