I need assistance with 2.c. I assume if I get an explanation for 2c,it will be t

Question

I need assistance with 2.c. I assume if I get an explanation for 2c,it will be the same for d and e. Thank you.

cross? And approximately how many ofspring oe plenoty type male. These three alleles are located on chromosome II (autosome) in Drosophila. You testcross one of the Fi females to a male with all three mutations and record the results from the testcross in following table. 2. You mate a female fly with a black body, purple eyes, and vestigial wing size to a wild- Phenotype # of each phenotype Body color eye color wing size normal normal vestigial red 900 purple no ray grayred Gray black 90 50 60 100 12 850 purple vestigial red normal black purplenorma red black black vestigial Purple vestigial a. Which phenotypes of the offspring are parental? b. Which phenotypes of the offspring are recombinants? c. What is the distance between body color and eye color genes? (Show your steps) d. What is the distance between eye color and wing size genes? (Show your steps) e. What is the distance between body color and wing size genes? (Show your steps) f. Sketch approximate map distance between each locus. g. Calculate crossover interference (I-1-C) h. Is it a negative or positive interference? i. What is the biological meaning of your calculated interference? a genetic map indicating the relative loci for each of these three alleles, and indicate the

Explanation / Answer

Distance between 2 genes can be calculated by estimating Recombination Frequency (RF).

RF (in %) = (No. of single crossovers (SCO) + No. of Double crossovers (DCO) / Total progeny)* 100

Two genes show 1% RF if they are located 1 map units (m.u.) or 1 centi Morgan (cM) apart.

Gray body/ purple eye color / vestigial wings (#50) and black body/ red eye/ normal wings (#60)

Recombination Frequency (RF) = (50 + 60 + 8 + 12 / 2070 )*100

= (130 / 2070)*100

= 6.28 %

Distance between body color and eye color genes is 6.28 m.u.

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