SECTION Fly Transposon Lab (1.4 pt) 6. On week 1, we set up a cross for you in w

Question

SECTION Fly Transposon Lab (1.4 pt) 6. On week 1, we set up a cross for you in which we m mated MAE-UAS females to 2-3 males KI P/AZ-3 Ki P/A2-3) a.o5 pts) Which phenotypes (circle all that apply)? cross and morphological features will be present in the male progeny of this featu (a) long bristles (b) short, bent bristles (c) red eyes (d) white eyes (e) gray body color ( yellow body color (g) sex combs (h) pointed abdomen () ovipositor (j) pigmented external genitalia b. (0.2 pts) In the progeny from this cross, which of the markers (alleles) exhbit a ype? c. (0.2 pts) Why is transposition of P/ 42-3/ to the X chromosome unlikely? d. (0.3 pts) What is the main goal of the cross to be set up on week 3? In your answer, state which one phenotypic marker is most important in ascertaining if the goal has been achieved 0.2 pts) The Fly Lab is a type of mutagenesis screen. What are we screening for (focus on what you d. ( will see on week 9)7

Explanation / Answer

Answer part c: It can be clearly seen from the diagrammatic representation of the gene map that the genes are located too close to each other on the chromosome and hence, a transition between location 2 and 3 is not possible. Studies have shown both experimentally and practically that in order to establish a recombination event between two genes, they must be located more than 30 map units apart from each other. If the genes are located less than or equal to 30 map units apart on the chromosome, they will be linked to each other and will be inherited as a single unit.

Here, the condition is similar and the genes seem to be located too close to each other to undergo a transitional mutation.

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