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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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
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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
vermilion mutation (v) and the autosomal recessive scarlet (s)
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