Homework Answers
As three genes are involved it is a case of double crossover in
which the genotype with highest number of offspring represent the
no crossover and the lowest represent the double crossover and the
rest are single crossover. The 'c' gene is in between the gene a
and b. So the map distance between b and c genes is 10.81
map units. The calculation is shown below:-
So the correct option is 10.81 map units.( the distance between gene b and c).
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A cross is made between a heterozygote, +++/abc, and a recessive homozygote, abc/abc. Analysis of the...
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
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...
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...
4. You are studying three genes in corn and performed a three-point cross. The three genes...
4. You are studying three genes in corn and performed a three-point cross. The three genes are green (V) vs Viniscent (V) seedlings, blue (Pr) vs red kernels (pr) and white (B ) or brown (bm) leaf midrib color. The table below list the offspring resulting from a testcross with a female F1 heterozygote. Type of gamete (NR, SCO, DCO Phenotype Progeny Gamete from F1 heterozygote Virescent seedling red 101 kernel Red kernel 175 Red kernel, brown midrib 259 Virescent...
9. You have been asked to determine the map distances between two SNP loci R and Q in wheat. The following cross was undertaken: RARG QcQrx RARA QcQc and yielded progeny as shown below. RARA QrQc RAR...
9. You have been asked to determine the map distances between two SNP loci R and Q in wheat. The following cross was undertaken: RARG QcQrx RARA QcQc and yielded progeny as shown below. RARA QrQc RARA QcQc 259 235 242 264 What are the genotypes of the parents of this cross? a) Give the map distance in centiMorgans between these two loci. (Show your work) c) Can you reject hypothesis of no linkage using a Chi-square test? (Show your...
A cross was made between a male fruit fly with purple eyes and two different female...
A cross was made between a male fruit fly with purple eyes and two different female flies with red eyes. The first female produced 41 progeny that all had red eyes, whereas the second female produced 18 progeny with red eyes and 21 progeny with purple eyes. a. Diagram the two crosses in words (you don't need to show the genotypes yet). b. Which eye color is dominant and which is recessive? How do you know? c. Choose a symbol...
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...
A) what are the ley reagents needed to PCR amplify this specific region of the mouse...
A)
what are the ley reagents needed to PCR amplify this specific
region of the mouse genome.
B) diagram the PCR fragment and the site of the RLFP on this
fragment woth lengeth in kb indicated.
C) what is the map distance between the deafness and his
RFLP?
diagram genotype and phenotype in crossing scheme snd explain
your answer.
In mice, PCR amplification of a specific DNA fragment revealed a simple autosomal RFLP. In some individuals, the fragment could be...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b)...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b) causes the wings to develop a blue color, while the dominant allele (b) permits wild-type colorless wings to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established garnet eyes gene (g). You cross a female heterozygous for both genes with a testcross male fly, and...
I included everything here , but i only need help with parts C-F You are working...
I included everything here , but i only need help with parts
C-F
You are working with a hypothetical fly and have found color and wing mutants. Preliminary work indicates that the mutant traits are recessive and the associated genes are not sex-linked, but beyond that you have no information. You first look at 2 genes, each with two alleles: "Borb" for body color and "Wor w" for wing surface. The red body phenotype is dominant to the yellow body...
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
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...
4. You are studying three genes in corn and performed a three-point cross. The three genes are green (V) vs Viniscent (V) seedlings, blue (Pr) vs red kernels (pr) and white (B ) or brown (bm) leaf midrib color. The table below list the offspring resulting from a testcross with a female F1 heterozygote. Type of gamete (NR, SCO, DCO Phenotype Progeny Gamete from F1 heterozygote Virescent seedling red 101 kernel Red kernel 175 Red kernel, brown midrib 259 Virescent...
9. You have been asked to determine the map distances between two SNP loci R and Q in wheat. The following cross was undertaken: RARG QcQrx RARA QcQc and yielded progeny as shown below. RARA QrQc RARA QcQc 259 235 242 264 What are the genotypes of the parents of this cross? a) Give the map distance in centiMorgans between these two loci. (Show your work) c) Can you reject hypothesis of no linkage using a Chi-square test? (Show your...
A cross was made between a male fruit fly with purple eyes and two different female flies with red eyes. The first female produced 41 progeny that all had red eyes, whereas the second female produced 18 progeny with red eyes and 21 progeny with purple eyes. a. Diagram the two crosses in words (you don't need to show the genotypes yet). b. Which eye color is dominant and which is recessive? How do you know? c. Choose a symbol...
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...
A)
what are the ley reagents needed to PCR amplify this specific
region of the mouse genome.
B) diagram the PCR fragment and the site of the RLFP on this
fragment woth lengeth in kb indicated.
C) what is the map distance between the deafness and his
RFLP?
diagram genotype and phenotype in crossing scheme snd explain
your answer.
In mice, PCR amplification of a specific DNA fragment revealed a simple autosomal RFLP. In some individuals, the fragment could be...
A new gene is being investigated in fruit flies. The recessive allele of this gene (b) causes the wings to develop a blue color, while the dominant allele (b) permits wild-type colorless wings to develop. Preliminary studies indicate that this new gene is located on the X-chromosome. You decided to perform a two-point testcross to determine its position relative to the well-established garnet eyes gene (g). You cross a female heterozygous for both genes with a testcross male fly, and...
I included everything here , but i only need help with parts
C-F
You are working with a hypothetical fly and have found color and wing mutants. Preliminary work indicates that the mutant traits are recessive and the associated genes are not sex-linked, but beyond that you have no information. You first look at 2 genes, each with two alleles: "Borb" for body color and "Wor w" for wing surface. The red body phenotype is dominant to the yellow body...
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