Help me answer B - E with explanation! The F1 females were then mated to triply

Question

Help me answer B - E with explanation!

The F1 females were then mated to triply mutant males. Notice that this is just a cross between the F1 progeny from above, and that the phenotype of the offspring will be determined by the maternal gametic contribution. The phenotypic results for the F1 cross is as follows: (gene orders are not certain) 400 385 70 69 a, b, c +, b, c a, +, c a, b, +35 35 b) Circle the parental genotypes. c) Box the double recombinants. d) Determine the order of the three loci on the X chromosome e) Estimate the gene distances between these alleles.

Explanation / Answer

Maxumum is parental .400 abd 385

Least is double recombinants 1 and 5

D.order of 3 loci BY COMPARING parentals and double recombinants +++and +b+ bgene is uncommon and it is at cenrte. Therefore gene order is a-b-c.

E. Map distance between a and b =70+69 crossovers between a and b+double recombinants(1+5)

Total progeny is 10000

map distance is 70+69+6/1000 multiplied by 100 is 145/1000=1.45x100=14.5 map units

map distance between b-c is crossover between b-c=35+35 + double recombinants(1+5)

75+6/1000 multiplied by 100=7.6 map units

map distance between a-c = all single recombinants 70+69+35+35=209/1000 multiplied by 100=20.9 map units

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