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 but I can not understand why. Please provide an explanation. Thank you very much.
A. Twenty of the progeny flies had red eyes and miniature bodies.
B. All of the progeny flies that had vermillion eyes and miniature bodies were also yellow.
C. Recombinant chromosomes present in the progeny flies were generated in the female.
D. The y-m distance is less than the sum of the y-v and v-m intervals because of undetected two strand double crossovers.
E. The genes for yellow body (y) and vermillion eye color (v) are linked
Homework Answers
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2. Yellow body (y), vermillion eye color (v) and miniature body
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Question 23 2.86/2.86 pts 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? Correct! 1/B 1/3 1/4 1/2
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In Drosophila, a cross between triply abnormal females with the X-linked recessive traits yellow bodies (y), echinus bristles (ec), and white eyes (w) and phenotypically normal males produces phenotypically normal F1 females. These F1 females are then testcrossed, and 1000 offspring occur as follows: Body Bristles Eyes number normal normal normal 447 yellow echinus white 442 yellow normal normal 18 normal echinus white 17 yellow normal white 28 normal echinus normal 33 normal normal white 8 yellow echinus normal 7...
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In Drosophila, the autosomal recessive brown eye color mutation (b) displays interactions with both the X-linked...
In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
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mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
homozygous for both the brown and scarlet mutations also have white
eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
A cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w), and cut (ch....
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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,...
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Question 3 Two true-breeding Drosophila are crossed: a normal-winged, red-eyed female and a miniature- winged, vermillion-eyed male. The Fl generation all have normal wings and red eyes. The FI offspring are crossed with miniature-winged, vermillion-eyes flies. The following offspring of that cross were counted. 233 normal wing, red eye 247 miniature wing, vermilion eye 7 normal wing, vermilion eye 13 miniature, red eye a) Explain what a testcross is (1 point). b) What is the expected phenotypic ratio from a...
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In Drosophila, the autosomal recessive brown eye color mutation
(b) displays interactions with both the X-linked recessive
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mutation. Flies homozygous for brown and simultaneously hemizygous
or homozygous for vermilion have white eyes. Flies simultaneously
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eyes. Flies that are wildtype at all 3 loci have wildtype eye
color. Flies that are homozygous or hemizygous for the recessive
mutant at only one...
A cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w), and cut (ch. A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut . The F, females were wild type for all three traits. • The F, males expressed the yellow-body and white-eye traits. The cross was carried to an F2 progeny, and only male offspring were tallied. On the basis of the data...
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