Please see attached genes B, Q and R are located on a chromosome as shown below:

Question

Please see attached genes B, Q and R are located on a chromosome as shown below: B 40 cM Q B,02 In the cross, and R are completely dominant to b, q and r. B r b R What is probability of obtaining ofspring which are homozygous recessive for b and r? A. 0.35 B. 0.70 C. 0 D. 0.25 E. 0.50 2. Genes A, B and D are located on the same chromosome in that order. A and B are 20 cM apart and B and D are 40 cM apart. The following testcross is performed: A B D females x abd males a b d a b d 2.A. Out of 1000 progeny, how many progeny that are phenotypically A d are expected? 2.B. There are 24 progeny with the phenotype A b D and 26 with the phenotype a B d. What is the interference value for this cross? 3. A fruit fly geneticist has determined that four genes, black body (b), dumpy (dpy), vestial wings (vg) and purple eyes (p) are all located on the Chromosome 2. She does a series of testcrosses with females heterozygous for different pairs of the genes with homozygous males and obtains the following map distances: b-p: 6 cM: dpy-vg: 49 c M: b-vg: 19 cM ; vg_p: 13 cM: dpy-p: 42 cM: dpy-b: 36 cM

Explanation / Answer

B Q and R are dominant

Above shown cross will have following offspring

Bbrr Bbrr bbRr bbRr

Therefore probability of recessive b gene is 0.5

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