Three recessive traits a, b, c are linked in this order. The map distances are as...
Three recessive traits a, b, c are linked in this order. The map distances are as follows:
a-b 20 cM
b-c 15cM
What is the expected number of double recombinants if you examine 1000 progeny?
The answer is 45, but I am not sure why
Homework Answers
Expected number of DCO = recombination frequency between ab × recombination frequency between bc × total number of progenies
Recombination frequency = distance between the genes / 100
Expected number of DCO = 20/100 × 15/100 × 1000 = 30
The answer is 30 for sure.
Please rate high.
Add Answer to:
Three recessive traits a, b, c are linked in this order. The map
distances are as...
2. Yellow body (y), vermillion eye color (v) and miniature body (m) are recessive X-linked traits...
2. Yellow body (y), vermillion eye color (v) and miniature body (m) are recessive X-linked traits in Drosophila. The order of the genes on the chromosome is y-v-m. The following cross is performed: y v m /y+ v+ m+ (female) X y v m/Y (male) The map distances shown below were generated using 1000 male progeny. y-v - 32.0 cM; y-m - 34.3 cM; v-m - 4.0 cM Which of the following statements is FALSE? The correct answer is B...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, bis associated with buckled wings, and is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. Which gene is in the middle? Testcross progeny phenotype Number curved 277 anomalous, buckled...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a,...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait; b is associated with buckled wings; and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as the following results. From this data, calculate the map distance between a and...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that are homozygous recessive for the three traits. The three autosomal recessive traits are glassy eyes (g), coal-colored bodies (c), and striped thoraxes (t). The three dominant traits are red eyes (g+), gray bodies (c+) and solid thoraxes (t+) (remember, the wild-type allele has a + after it). You examine 1000 progeny of the above cross and they have the following phenotypic classes: 265 g+c+t+ 275 gct 120 g+ct...
6. Fine spines (s), smooth fruit (tu), and uniform color (u) are three recessive traits in...
6. Fine spines (s), smooth fruit (tu), and uniform color (u) are three recessive traits in cucumbers. These genes are linked on the same chromosome. A cucumber plant heterozygous for all three traits is used in the testcross, and the following offspring are obtained: SU CCCCCC Reuuuna a) Determine the order of the genes on the chromosome. b) Calculate the map distances between the genes. c) Calculate the coefficient of coincidence and the interference among the genes. total: 230
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...
Three linked autosomal loci were studied in smurfs. Locus Dominant Allele Recessive Allele Color Blue Pink...
Three
linked autosomal loci were studied in smurfs.
Locus
Dominant
Allele
Recessive
Allele
Color
Blue
Pink
Mood
Happy
Gloomy
Height
Tall
Dwarf
Pure breeding pink, happy, tall smurfs were mated to pure
breeding blue, gloomy, dwarf smurfs. The F1 were
testcrossed and the testcross progeny are given below.
Phenotype
Number
pink, happy, tall
532
blue, gloomy, dwarf
517
pink, gloomy, tall
97
blue, happy, dwarf
84
blue, happy, tall
103
pink, gloomy, dwarf
111
blue, gloomy, tall
14
pink, happy,...
1. The following diagram shows the genetic map for a chromosome. A B C D 10cM...
1. The following diagram shows the genetic map for a chromosome. A B C D 10cM 5cM 40cM If a diploid female heterozygous for A and D (A D//a d) is testcrossed to a homozygous recessive male (a d/a d), what percent of the progeny are predicted to have the genotype A d/a d? A. 100 B. 75 C. 50 D. 25 E. Can’t be determined 2. Yellow body (y), vermillion eye color (v) and miniature body (m) are recessive...
Data Set B presents the results of a testcross using female flies heterzygous for three traits...
Data Set B presents the results of a testcross using female
flies heterzygous for three traits and male flies, which are
homozygous recessive for the same three traits.
Part B Data set B presents the results of a testcross using female flies heterozygous for three traits and male flies, which are homozygous recessive for the same three traits. For this part of the report do the following: a) Attach your data set to your report. b) Clearly indicate parental, SCO...
To draw a genetic map for three linked, recessive mutations for blowfish, rancid, spiny and toxic....
To draw a genetic map for three linked, recessive mutations for blowfish, rancid, spiny and toxic. You test triply heterozygous blowfish to toxic. The results are as follows: rancid spiny toxic r s t 1 rancid r + + 64 spiny + s + 84 rancid toxic r + t 96 toxic + + t 367 wild type + + + 4 spiny toxic + s t 46 rancid spiny r s + 338 total...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, bis associated with buckled wings, and is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. Which gene is in the middle? Testcross progeny phenotype Number curved 277 anomalous, buckled...
A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait; b is associated with buckled wings; and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as the following results. From this data, calculate the map distance between a and...
6. Fine spines (s), smooth fruit (tu), and uniform color (u) are three recessive traits in cucumbers. These genes are linked on the same chromosome. A cucumber plant heterozygous for all three traits is used in the testcross, and the following offspring are obtained: SU CCCCCC Reuuuna a) Determine the order of the genes on the chromosome. b) Calculate the map distances between the genes. c) Calculate the coefficient of coincidence and the interference among the genes. total: 230
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...
Three
linked autosomal loci were studied in smurfs.
Locus
Dominant
Allele
Recessive
Allele
Color
Blue
Pink
Mood
Happy
Gloomy
Height
Tall
Dwarf
Pure breeding pink, happy, tall smurfs were mated to pure
breeding blue, gloomy, dwarf smurfs. The F1 were
testcrossed and the testcross progeny are given below.
Phenotype
Number
pink, happy, tall
532
blue, gloomy, dwarf
517
pink, gloomy, tall
97
blue, happy, dwarf
84
blue, happy, tall
103
pink, gloomy, dwarf
111
blue, gloomy, tall
14
pink, happy,...
Data Set B presents the results of a testcross using female
flies heterzygous for three traits and male flies, which are
homozygous recessive for the same three traits.
Part B Data set B presents the results of a testcross using female flies heterozygous for three traits and male flies, which are homozygous recessive for the same three traits. For this part of the report do the following: a) Attach your data set to your report. b) Clearly indicate parental, SCO...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago