To find insertions into a specific region on chromosome 3, the researcher separately crosses individual F2 male flies with eye pigment to females heterozygous for a deletion on chromosome 3. Since this deletion is homozygous lethal (as most large deletions are), she uses flies that have one copy of a normal chromosome 3 as well as one copy with the deletion. The normal (non-deleted) chromosome 3 also carries a dominant mutation called Serrate, which produces notched wings. (This non-deleted chromosome also does not allow for recombination with the chromosome with the deletion). The females are also homozygous for the white mutation, meaning that any progeny with eye pigment will have a P-element insertion with its mini white marker. In this way, the researcher hopes to find P-element insertions in her screen that do not survive when paired with the deletion -- indicating that the insertions are in the region spanned by the deletion, and have caused a mutation in a gene essential for survival. When the researcher examines the progeny with eye pigment that result from these crosses, she finds two different categories of flies. Some crosses produce flies with eye pigment and notched wings, as well as flies with eye pigment and normal wings. Other crosses produce flies with eye pigment and notched wings, but no flies with eye pigment and normal wings. What might explain these results
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Biology, 21.06.2019 16:30, lucylubugg
Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells
Answers: 2
Biology, 22.06.2019 03:30, crispingolfer7082
State officials are considering constructing a road through a forested wilderness area. this action will likely affect the forest ecosystem in various ways. part a: predict how the construction of a road could negatively affect plants and animals in that ecosystem. (3 points) part b: describe one way that the construction of a road could have a positive impact of the forest ecosystem. (1 point)
Answers: 1
To find insertions into a specific region on chromosome 3, the researcher separately crosses individ...
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