4. How does crossing-over affect the observed outcomes? Explain why the observed flies do not match your prediction. 5. The percentage of crossing over events is used to develop a map of chromosomes. View the chromosome map on the last page. How far apart are the alleles for black body and vestigial wings? (Do the math!) View the proportion of flies from your data that indicate crossover occurred (VG and BL flies) and multiply it by 100. Based on your data, how far apart are these alleles?
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Crossing-over affects the observed outcomes by creating new combinations of genes that were not present in the parent organisms. This is due to the exchange of genetic material between homologous chromosomes during meiosis. The observed flies may not match the Show more…
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2) A series of two-point crosses among fruit flies is carried out between genes for brown eyes (bw), arc wings (a) vestigial wings (vg), ebony body color (e) and curved wings (cv). The following number of nonrecombinant and recombinant progeny were obtained from each cross: Using these data from two-point crosses, create a genetic map for these genes, providing the order of the genes and the best estimates of the distances separating them. Recombination frequencies: The genetic map:
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5. Calculate the distances between y, w, and m. Show your work and each distance. (3) 6. Draw a chromosome map of the Drosophila X- chromosome including all three genes in the correct order. Indicate the distance between them. (3) 7. Write a conclusion paragraph about this experiment, address the points below for full credit. (3) a. What is the source of recombination? b. How are map units related to recombination frequency? c. Is it possible for genes on the same chromosome to be unlinked? If so, under what circumstances?
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A wild-type fruit fly (heterozygous for gray body color and normal wings) is mated with a black fly with vestigial wings. The offspring have the following phenotypic distribution: wildtype, $778 ;$ black vestigial, $785 ;$ black normal, $158 ;$ gray vestigial, 162. What is the recombination frequency between these genes for body color and wing size? Is this consistent with the results of the experiment in Figure 15.9 ? Draw the chromosomes in the wild-type and black parents.
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