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Questions 4 and 5 and 6.  The test cross of a female mouse that was heterozygous at...

Questions 4 and 5 and 6.  The test cross of a female mouse that was heterozygous at the three loci A B C to a male that was homozygous recessive at all three loci resulted in the offspring listed below.

+ + +     71      

+ + c      6

+ b +    319

+ b c    105

a + +    100

a + c    321

a b +      4

a b c       74

           1000

From the data presented above calculate the genetic map distance between a and c.

Select one:

a. a and c are unlinked and map units cannot be calculated

b. between 35.1 and 49.9 map units

c. between 0 and 13 map units

d. between 28.7 and 35 map units

e. between 13.1 and 28.6 map units

The test cross of a female mouse that was heterozygous at the three loci A B C to a male that was homozygous recessive at all three loci resulted in the offspring listed below.

+ + +     71      

+ + c      6

+ b +    319

+ b c    105

a + +    100

a + c    321

a b +      4

a b c       74

           1000

From the data presented above calculate the genetic map distance between b and c.

Select one:

a. b and c are unlinked and map units cannot be calculated

b. between 0 and 13 map units

c. between 40.1 and 49.9 map units

d. between 28.7 and 40 map units

e. between 13.1 and 28.6 map units

The test cross of a female mouse that was heterozygous at the three loci A B C to a male that was homozygous recessive at all three loci resulted in the offspring listed below.

+ + +     71      

+ + c      6

+ b +    319

+ b c    105

a + +    100

a + c    321

a b +      4

a b c       74

           1000

From the data presented above calculate the interference.  Chose the closest answer.

Select one:

a. 0.67

b. 0

c. 1.0

d. 0.33

e. interference cannot be calculated from the data

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Answer #1

the greater number are of parental type whereas the lowest number of double crossover type. The middle chain is left between the homologous chromosomes during the double Cross over.

please look in the image for solution:

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