Homework Answers
A test cross is performed to determine the map distance between alleles. The frequency of recombination is obtained by conducting test cross, and the frequency of recombination is equal to map distance.
a). So, we will recessive heterozygous fly for the mapping project. Its genotype will be ststssssebeb and its phenotype will be scarlet eyes, ebony body color and spineless.
b). The parental gametes produced will be the two two arrangements given in the figure. Which is st+sseb and stss+eb+.
c). According to the arrangement, the double crossovers will be st+ss+eb and stsseb+.
d). To obtain wild type phenotype, that is st+ss+eb+, only one loci should be recombined in the second arrangement or chromosome, so it will be a case of single crossover between st and st+ loci.
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can you please help me with number 4?
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4. (2 points) In the fruit fly Drosophila, a rudimentary wing called "vestigial" and dark body color called "ebony" are inherited at independently assorting genes and are recessive to their dominant wild-type counterparts, full wings and gray body color. Wild-type males and females heterozygous for both traits are crossed, and 1800 progeny are are expected to be found with each possible phenotype? produced. How many progeny flies Full wing dominant Grol...
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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...
can you please help me with number 4?
An example of linked genes in Drosophila The genes for wing shape and body color are linked (they are on the same chromosome) Drosophila and linked genes In the example shown left, wild type alleles are dominant and are given an upper case symbol of the mutant phenotype (Cu or Eb). This notation used for Drosophila departs from the convention of using the dominant gene to provide the symbol. This is necessary...
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