Time for some more xenobiology. In aliens, glossy exoskeleton (G) is dominant to dull exoskeleton (g),...
- Time for some more xenobiology. In aliens, glossy exoskeleton
(G) is dominant to dull exoskeleton (g), excessive drooling (D) is
dominant to normal drooling (d), and highly acidic blood (A) is
dominant to mildly acidic blood (a). Genetic researchers at
Weyland-Yutani Corporation perform a three-point testcross to map
the relative locations of these genes. They crossed heterozygotes
for all three traits with recessive homozygotes and the results are
summarized in the table below.
- Which progeny from the table are the nonrecombinants?
- Which progeny from the table are the double crossovers? What is the gene order for this experiment?
- In the Table, using linkage notation and the gene order from
(b),
assign genotypes to each phenotype.
|
Phenotypes |
Genotypes |
Observed Number |
|
Glossy, excessive drooling, highly acidic |
45 |
|
|
Dull, normal drooling, mildly acidic |
43 |
|
|
Glossy, excessive drooling, mildly acidic |
138 |
|
|
Dull, normal drooling, highly acidic |
150 |
|
|
Glossy, normal drooling, highly acidic |
8 |
|
|
Dull, excessive drooling, mildly acidic |
4 |
|
|
Glossy, normal drooling, mildly acidic |
302 |
|
|
Dull, excessive drooling, highly acidic |
310 |
|
|
Total |
1000 |
- Calculate the recombination frequencies and draw the genetic map showing the correct gene order and distances between genes.
- Calculate the coefficient of coincidence.
- Calculate the interference value.
Homework Answers
Add Answer to:
Time for some more xenobiology. In aliens, glossy exoskeleton
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Answer the following questions analyzing the three...
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a. alleles b. autosomes c. dominant allele d. genotype e.
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1. ________________ genetic make-up
2. ________________ how genetic make-up is expressed
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4. ________________ alternative forms of the same gene
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