Homework Answers
From the table, it is evident that , yellow body.vermilion eyes and brown body.red eyes are the recombinant ones and the rest two are parental. Because recombination frequency can never exceed 50% as independent assortment of genes result in maximum 50% recombination
Therefore recombination frequency is (160+170)/(160+170+338+332) = 0.33 or 33%. Therefore the genes are completely linked to each other and do not assort independently.
Since yellow body.red eyes is one of the parental variety ,the genotype must be yyv+v . The other parental genotype of brown body.vermilion eyes is y+yvv . Since the gamete arrangement is yv+ and y+v, the allele arrangement in the heterozygous female can be termed as trans or repulsion conformation.
The gene distance can be calculated in terms of recombination frequency. Since the frequency is 33%, the distance between the genes is 33 cM (centiMorgan) or 33 mu (Map units).
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6. (7 points) Dr. O. Sophila is a famous geneticist who studies recombination of genes in...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes and is recessive to the wildtype red eye color (v+). An allele y of the yellow gene, gives flies a yellow body color compared to the dominant brown body color (yt). A heterozygous females for the two different mutations is test-crossed with mutant (i.e., homozygous recessive) males. The phenotypes of the progeny of this cross and their corresponding numbers are given below Yellow body,...
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...
The allele se gives Drosophila a sepia body and se+ gives brown, the wild-type phenotype. The...
The allele se gives Drosophila a sepia body and se+ gives brown,
the wild-type phenotype. The allele ro of a separate gene gives
rough eyes and ro+ gives smooth eyes, the wild-type phenotype. The
allele ss of a third gene gives flies without thorax spines and ss+
gives flies with thorax spines, the wild-type phenotype.
When females heterozygous for each of these genes were
testcrossed with sepia, rough, spineless males, the following
classes and numbers of progeny were obtained:
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Question 5 (14 marks) The allele cn gives fruit flies cinnabar eyes, whereas the allele cn...
Question 5 (14 marks) The allele cn gives fruit flies cinnabar eyes, whereas the allele cn gives red, the wild-type phenotype. The allele wx of a separate allele gives waxy wings, and wx gives non-waxy wings (wild-type). The allele b of a third gene gives fruit flies a black body, whereas the allele b gives a brown (wild-type) body colour. A geneticist knows these three genes are on the same chromosome, but does not know what order the genes are...
Please answer the following two questions. Show all your work. Thanks in advance. 9. In Drosophila...
Please answer the following two questions. Show all your work. Thanks in advance. 9. In Drosophila yellow body color is caused by a sex-linked recessive allele and brown eye color is an autosomal recessive trait. A phenotypically normal female fly, heterozygous for both genes, is crossed to a male with normal body color and brown eyes. What proportion of their offspring should have yellow body color and brown eyes? A) 1/16 B) 1/8 C) 1/4 D) 3/16 E) 3/8 ANSWER:...
4. You are studying three genes in corn and performed a three-point cross. The three genes...
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3. In a series of mapping experiments, the recombination frequencies for four different linked genes of...
3. In a series of mapping experiments, the recombination frequencies for four different linked genes of Drosophila were determined as shown in the figure below. Wildtype (dominant) is flat wings, medium leg length, brown abdomen, and medium bristle length. w curled wings 1 short legs a - red abdomen b long bristles g23 O a 12 11 0 b 20 3 8 0 w a b The numbers in the boxes are the recombinatior frequencies in between the genes (in...
can someone verify this? In Drosophila, alternate alleles of an X chromosome gene, white, determine red...
can someone verify this?
In Drosophila, alternate alleles of an X chromosome gene, white, determine red eyes (w') and white eyes (w). Alternate alleles of a second X chromosome gene, yellow, determine brown body ) and yellow body (). In cross series A and B, the F1 females are heterozygous for both genes, but the arrangement of alleles in the parental generation is different in each case. Study the genotypes and phenotypes of the P, F1, and F2 flies in...
For Questions 15-18 The allele b gives Drosophila a black body, and b+ gives brown (the...
For Questions 15-18 The allele b gives Drosophila a black body, and b+ gives brown (the wildtype). The allele wx of a second gene gives waxy wings and wx* gives nonwaxy wings (the wildtype). The allele en of a third gene gives cinnabar eyes and cngives red (the wildtype). A female heterozygous for these three genes is testcrossed and 1000 progeny are classified as followst b, wx, en 389 b, wx, en 379 bt, wx, cn b, wx, en 67...
2. The allele b gives Drosophila flies a black body, and bt gives brown, the wild-type...
2. The allele b gives Drosophila flies a black body, and bt gives brown, the wild-type phenotype. The allele wx of a separate gene gives waxy wings, and wx+ gives nonwaxy, the wild-type phenotype. The allele cn of a third gene gives cinnabar eyes, and cn* gives red, the wild-type phenotype. A female heterozygous for these three genes is testcrossed, and 1000 progeny are classified as follows: 5 wild type, 6 black waxy cinnabar, 69 waxy cinnabar, 67 black, 382...
the fruit fly, Drosophila melanogaster, an allele (v) of the gene vermillion gives flies purple eyes and is recessive to the wildtype red eye color (v+). An allele y of the yellow gene, gives flies a yellow body color compared to the dominant brown body color (yt). A heterozygous females for the two different mutations is test-crossed with mutant (i.e., homozygous recessive) males. The phenotypes of the progeny of this cross and their corresponding numbers are given below Yellow body,...
The allele se gives Drosophila a sepia body and se+ gives brown,
the wild-type phenotype. The allele ro of a separate gene gives
rough eyes and ro+ gives smooth eyes, the wild-type phenotype. The
allele ss of a third gene gives flies without thorax spines and ss+
gives flies with thorax spines, the wild-type phenotype.
When females heterozygous for each of these genes were
testcrossed with sepia, rough, spineless males, the following
classes and numbers of progeny were obtained:
wild...
Question 5 (14 marks) The allele cn gives fruit flies cinnabar eyes, whereas the allele cn gives red, the wild-type phenotype. The allele wx of a separate allele gives waxy wings, and wx gives non-waxy wings (wild-type). The allele b of a third gene gives fruit flies a black body, whereas the allele b gives a brown (wild-type) body colour. A geneticist knows these three genes are on the same chromosome, but does not know what order the genes are...
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...
3. In a series of mapping experiments, the recombination frequencies for four different linked genes of Drosophila were determined as shown in the figure below. Wildtype (dominant) is flat wings, medium leg length, brown abdomen, and medium bristle length. w curled wings 1 short legs a - red abdomen b long bristles g23 O a 12 11 0 b 20 3 8 0 w a b The numbers in the boxes are the recombinatior frequencies in between the genes (in...
can someone verify this?
In Drosophila, alternate alleles of an X chromosome gene, white, determine red eyes (w') and white eyes (w). Alternate alleles of a second X chromosome gene, yellow, determine brown body ) and yellow body (). In cross series A and B, the F1 females are heterozygous for both genes, but the arrangement of alleles in the parental generation is different in each case. Study the genotypes and phenotypes of the P, F1, and F2 flies in...
For Questions 15-18 The allele b gives Drosophila a black body, and b+ gives brown (the wildtype). The allele wx of a second gene gives waxy wings and wx* gives nonwaxy wings (the wildtype). The allele en of a third gene gives cinnabar eyes and cngives red (the wildtype). A female heterozygous for these three genes is testcrossed and 1000 progeny are classified as followst b, wx, en 389 b, wx, en 379 bt, wx, cn b, wx, en 67...
2. The allele b gives Drosophila flies a black body, and bt gives brown, the wild-type phenotype. The allele wx of a separate gene gives waxy wings, and wx+ gives nonwaxy, the wild-type phenotype. The allele cn of a third gene gives cinnabar eyes, and cn* gives red, the wild-type phenotype. A female heterozygous for these three genes is testcrossed, and 1000 progeny are classified as follows: 5 wild type, 6 black waxy cinnabar, 69 waxy cinnabar, 67 black, 382...
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