In: Biology
Directions: Solve the question 1st, then place the answer in the appropriate blank.
In Drosophila, cinnabar eye color (c), vestigal wings (v) and plexus wing veins (p) are all autosomal recessive mutations linked on chromosome 2. A true-breeding cinnabar, vestigal winged female was crossed to a true-breeding plexus vein male. The wild type F1 females were mated to a plexus, vestigal winged male with cinnabar eyes and the following progeny were obtained.
Cinnabar |
Vestigial |
Plexus |
total |
c |
v |
p |
45 |
c+ |
v+ |
p+ |
52 |
c |
v |
p+ |
384 |
c+ |
v+ |
p |
375 |
c |
v+ |
p |
6 |
c+ |
v |
p+ |
9 |
c |
v+ |
p+ |
64 |
c+ |
v |
p |
65 |
total |
1000 |
Please solve the problem and complete the following fill-in the blank questions.
a. What is the gene order on chromosome 2?
b. What is the distance between cinnabar eyes and vestigal wings?
c. What is the distance between vestigal wings and plexus veins?
d. What is the distance between cinnabar eyes and plexus veins?
e. What is the interference in this cross?
The greater number are of parental type and the lowest number are of double cross over type. The middle gene is swapped between the homologous chromosomes during the double cross over.
Please look in the image for solution:
Look carefully for c and d part. Because i have done d part first than c part.
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