The following is a testcross of females flies heterozygous for three traits and male flies which...
The following is a testcross of females flies heterozygous for three traits and male flies which are homozygous recessive for the same three traits.
|
a b c |
451 |
|
a + + |
172 |
|
+ b + |
171 |
|
+ + + |
459 |
|
+ b c |
180 |
|
a + c |
178 |
|
+ + c |
96 |
|
a b + |
92 |
a) Determine the parental, SCOI, SCOII and DCO classes
b) Determine Gene Order
c) Rewrite the table with the right gene order
d) Calculate the recombinant frequencies (map distances) and make a genetic map for the three genes
Homework Answers
a.) abc- Parental 1
+++ - Parental 2
ab+ - DCO
c++ - DCO
a++ -SCO1
cb+ -SCO1
ac+ - SCO2
b++ - SCO2
b.) Gene order can be known from taking parental and double cross over gentotypes. In the first DCO ab+, this is different from the parental genotype because it doesn't have c allele. This parental allele c is not associated with the other two parental alleles as it was in the parental allele. Therefore c is in the middle and the correct gene order is acb.
c.) Correct gene order table-
acb- P1
+++ - P2
a+b- DCO
+c+ - DCO
a++ - SCO1
+cb- SCO1
ac+- SCO2
++b - SCO2
d.)
Add Answer to:
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Data set B presents the results of a testcross using female flies heterozygous for three traits...
Data set B presents the results of a testcross using female
flies heterozygous for three traits and male flies, which are
homozygous recessive for the same three traits. For this part of
the report do the following:You have first to determine the gene
order. Construct a genetic map for these three genes, including the
map distances between them. Clearly indicate the logic you followed
and show all your calculations.
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Data set B presents the results of a testcross using female
flies heterozygous for three traits and male flies, which are
homozygous recessive for the same three traits. For this part of
the report do the following:You have first to determine the gene
order. Construct a genetic map for these three genes, including the
map distances between them. Clearly indicate the logic you followed
and show all your calculations.
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