Explain why two genes 50 or more map units apart on a genetic map can only...
Explain why two genes 50 or more map units apart on a genetic map can only result in a maximum of 50% recombinant gametes in two point cross. To answer this, ask yourself what percentage of recombinant gametes would result if the probability of crossing over in a tetrad involving these genes were 100%, as it would be if the two genes are 50 or more map units apart.
Homework Answers
Two genes which are up to 50 map units from each other will show crossing over. But if the distance is more than 50 then they are very far from each other. In this case they can not undergo crossing over therefore they show independent assortment.
As distance between two genes increases, the rate of recombination decreases. When the two genes are close to each other, they are said to be linked and show recombination and when the two genes are far from each other, they are unlinked and show independent assortment.
If there is 100% crossing over in a tetrad, then Recombinant gametes will be formed. Suppose two genes are A and B. AB/AB and ab/ab are showing 100% crossing over. Than Ab and aB gametes will be formed.
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Explain why two genes 50 or more map
units apart on a genetic map can only...
27. An individual has the following genotype. Gene loci (A) and (B) are 15 map units...
27. An individual has the following genotype. Gene loci (A) and (B) are 15 map units apart, which determines their probability of recombination. 1) Indicate all the possible gametes that this individual can produce (with crossing over), 2) Label the gametes that are recombinant and non- recombinant. 3) Calculate the recombination frequency of the recombinant and non-recombinant gametes. The genes are not COMPLETELY linked. 28. Now imagine the genes are completed linked in #27. 1) What are all possible gametes?
If two genes are 24 cM apart on a genetic linkage map, how many recombinant offspring...
If two genes are 24 cM apart on a genetic linkage map, how many recombinant offspring would you expect out of 150? A. Depends if they are cis or trans B. 18 C. 24 D. 36 E. 12
what is the crossover percentage between two genes that are 10 map units apart 2. (25...
what is the crossover percentage between two genes that are 10
map units apart
2. (25 points) In a monohybrid, the phenotype of the F2 generation will follow a ratio of In a dihybrid, the phenotype of the F2 generation will follow a ratio of When performing a chi-square analysis, the cutoff p value is- The degree of freedom (df) for a monohybrid and the degree of freedom for dihybrid is The formula to calculate the chi-square is 3. 25...
You see a recombination frequency of 50% between two genes. Which of the following possibilities can...
You see a recombination frequency of 50% between two genes. Which of the following possibilities can you exclude? That the genes are located close together on the same chromosome That the genes are on different chromosomes O That the genes are assorting independently That the genes are located on the same chromosome, but very far apart Meiosis contributes to genetic diversity by: o Reducing the number of chromosomes for karyogamy (fusion of nuclei) with another gamete O Recombining homologous chromosomes...
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...
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...
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...
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...
2. Two particular genes are linked and 14 map units apart. A GBIGB individual is mated...
2. Two particular genes are linked and 14 map units apart. A GBIGB individual is mated with a gblgb individual. a) Show the genotype of an FI offspring demonstrating linkage. b) What gametes can the Fl produce AND in what frequency? If the F1 generation mate amongst themselves, what is the frequency of GGbh F2 offspring? (show your work) c)
1.) Explain why linkage measurements are more accurate for two genes that are close together than...
1.) Explain why linkage measurements are more accurate for two genes that are close together than two genes that are farther apart. 2.) A female poodle with green eyes (recessive) and yellow spots on her tongue (recessive) was bred with a male poodle who was the wild-type phenotype but hybrid genotype for those same two traits. In a series of litters, this breeding pair gave birth to the following 85 puppies: 39 Normal eyes, normal tongue 36 Green eyes, yellow-spot...
27. An individual has the following genotype. Gene loci (A) and (B) are 15 map units apart, which determines their probability of recombination. 1) Indicate all the possible gametes that this individual can produce (with crossing over), 2) Label the gametes that are recombinant and non- recombinant. 3) Calculate the recombination frequency of the recombinant and non-recombinant gametes. The genes are not COMPLETELY linked. 28. Now imagine the genes are completed linked in #27. 1) What are all possible gametes?
what is the crossover percentage between two genes that are 10
map units apart
2. (25 points) In a monohybrid, the phenotype of the F2 generation will follow a ratio of In a dihybrid, the phenotype of the F2 generation will follow a ratio of When performing a chi-square analysis, the cutoff p value is- The degree of freedom (df) for a monohybrid and the degree of freedom for dihybrid is The formula to calculate the chi-square is 3. 25...
You see a recombination frequency of 50% between two genes. Which of the following possibilities can you exclude? That the genes are located close together on the same chromosome That the genes are on different chromosomes O That the genes are assorting independently That the genes are located on the same chromosome, but very far apart Meiosis contributes to genetic diversity by: o Reducing the number of chromosomes for karyogamy (fusion of nuclei) with another gamete O Recombining homologous chromosomes...
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...
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...
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...
2. Two particular genes are linked and 14 map units apart. A GBIGB individual is mated with a gblgb individual. a) Show the genotype of an FI offspring demonstrating linkage. b) What gametes can the Fl produce AND in what frequency? If the F1 generation mate amongst themselves, what is the frequency of GGbh F2 offspring? (show your work) c)
1.) Explain why linkage measurements are more accurate for two genes that are close together than two genes that are farther apart. 2.) A female poodle with green eyes (recessive) and yellow spots on her tongue (recessive) was bred with a male poodle who was the wild-type phenotype but hybrid genotype for those same two traits. In a series of litters, this breeding pair gave birth to the following 85 puppies: 39 Normal eyes, normal tongue 36 Green eyes, yellow-spot...
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