Homework Answers
Answer:
3).
a).
The cross is Dihybrid test cross. According to Mendel experiments, Dihybrid test cross ratio is 1:1:1:1 when the two genes are assorted independently. But the number of each genotype would not fit in the ratio. Hence, the two genes are linked.
b).
Hint: Always recombinant progeny are small numbered in linkage problems.
Recombination frequency (RF)= (number of recombinants / Total number of progeny) 100
RF= (9+12/100) 100
RF = 21%
RF (%) = Distance between the genes (map units)
Distance between a and b = 21 m.u.
c).
Heterozygote would be Ab/aB. This indicates that the A and B loci in repulsion.
4).
a).
The cross is Dihybrid test cross. According to Mendel experiments, Dihybrid test cross ratio is 1:1:1:1 when the two genes are assorted independently. But the number of each genotype would not fit in the ratio. Hence, the two genes are linked.
b).
Hint: Always recombinant progeny are small numbered in linkage problems.
Recombination frequency (RF)= (number of recombinants / Total number of progeny) 100
RF= (21+13/255) 100
RF = 13.33%
RF (%) = Distance between the genes (map units)
Distance between a and b = 13.33 m.u.
c).
Purple = B; blue = b
Long = R; Round = r
Heterozygote would be purple, long / blue, round = BR/br. This indicates that the B and R loci in coupling.
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please help with these 3 questions. thank you!
Name: A cross between individuals with genotypes AaBb...
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12. Imagine a cross between AaBb x aabb produces progeny in the following proportions: | AaBb...
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Homework Chanter 7 This homework is due at the beginning of class on Friday 4/5/19 The questions below are slightly modified versions of questions taken from the Genetics, A Concgptual Approath. 4th edition by Benjamin Picrce, Chapter 7, Application Question and Problems A coss between individuals with genotypes AaBh x aubb produces the following offspring Genotype Number of offspring AaBb Aabh 38 41 12 aaBb aubb a. Do the evidence suggest that the a and b loci are linked? Explain...
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5. You started working in a Drospohila lab. You are studying two different autosomal traits, body color and antennae length. Gray body (B) is completely dominant to black body (b) and long antennae length (A) is completely dominant to short antennae length (a). You cross true-breeding gray bodied, long antennae files to true-breeding black bodied, short antennae. The F1 progeny all have gray bodies and long antennae. a. You perform a testcross to the F1 progeny produced from the parent...
Can you explain how to formulate map units in these types of questions? I have a...
Can you explain how to formulate map units in these types of
questions?
I have a answered but i would like help with part B.
2. Recombination frequency is given below for several gene pairs. Create a linkage map for these genes, showing the map unit distance between loci. j, k 12%; k, 1 6%; j, m 9%; 1, m 15% 3. In guinea pigs, black (B) is dominant to brown (b), and solid color (S) is dominant to spotted...
Please answer all of the following questions and show all work if needed please. You are...
Please answer all of the following questions and show all work if
needed please.
You are interested in understanding the genomics of skin anatomy of the goblins that live under your stairs (hal), in particular you are interested in the linkage between the genes that control skin coloration (green), degree of hairness (hairy), and presence of copious amounts of warts (warty) You've determined the distance between the genes (see table below) Distance between Genes compared the loci green-hairy hairy-warty 9.2...
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...
12. Imagine a cross between AaBb x aabb produces progeny in the following proportions: | AaBb 31 aabb | 33. Aabb | 12 aaBb] 13 Based on this information, are genes A and B linked, or do they assort independently (Chi-square test)? IF linked, what is the genetic distance between A and B? Are gene A and B in coupling (cis) or repulsion (trans) conformation in the AaBb parent? How can you tell?
Homework Chanter 7 This homework is due at the beginning of class on Friday 4/5/19 The questions below are slightly modified versions of questions taken from the Genetics, A Concgptual Approath. 4th edition by Benjamin Picrce, Chapter 7, Application Question and Problems A coss between individuals with genotypes AaBh x aubb produces the following offspring Genotype Number of offspring AaBb Aabh 38 41 12 aaBb aubb a. Do the evidence suggest that the a and b loci are linked? Explain...
Help Center 07 Question 38 What phenotypic ratio of offspring would result from a cross between a white-eyed male fruit fly, and a female that is heterozygous for red eye color? (See Chapter 8.3 Figure your e Text) 2 white-eyed females 2 red-eyed males V none of these 2 red-eyed female 1 white-eyed female: 1 red-eyed male: 2 white-eyed male 1 red-eyed female 1 white-eyed female 1 red-eyed male: 1 white-eyed male 2 red-eyed females: 2 white-eyed males Question 39...
11. From the data below, indicate which values in the table that you would use for the product-ratio method to determine the map distance between the two genes. The parents were in coupling. One parent had purple stems and cut leaves while the other parent had green stems and potato leaves. Table 1. The number of progeny produced from various crosses involving genes for stem color and leaf shape in Lycopersicon esculentum [tomato). Parent 2 is homozygous recessive. Purple Stems...
5. You started working in a Drospohila lab. You are studying two different autosomal traits, body color and antennae length. Gray body (B) is completely dominant to black body (b) and long antennae length (A) is completely dominant to short antennae length (a). You cross true-breeding gray bodied, long antennae files to true-breeding black bodied, short antennae. The F1 progeny all have gray bodies and long antennae. a. You perform a testcross to the F1 progeny produced from the parent...
Can you explain how to formulate map units in these types of
questions?
I have a answered but i would like help with part B.
2. Recombination frequency is given below for several gene pairs. Create a linkage map for these genes, showing the map unit distance between loci. j, k 12%; k, 1 6%; j, m 9%; 1, m 15% 3. In guinea pigs, black (B) is dominant to brown (b), and solid color (S) is dominant to spotted...
Please answer all of the following questions and show all work if
needed please.
You are interested in understanding the genomics of skin anatomy of the goblins that live under your stairs (hal), in particular you are interested in the linkage between the genes that control skin coloration (green), degree of hairness (hairy), and presence of copious amounts of warts (warty) You've determined the distance between the genes (see table below) Distance between Genes compared the loci green-hairy hairy-warty 9.2...
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...
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