21-22. You have crossed Neurospora mutants unable to grow in the absence of argi

Question

21-22. You have crossed Neurospora mutants unable to grow in the absence of arginine and proline to a wild type strain. After sporulating the resulting diploids, you obtained the following tetrads: PRO ARG PRO arg PRO ARG PRO ARG PRO ARG PRO arg PRO ARG PRO arg PRO arg PRO ARG PRO arg PRO arg pro arg pro ARG pro arg pro arg pro ARG pro arg pro arg pro ARG pro ARG a b ARC ro ARG ro arg ro What is the distance between arginine and proline auxotrophy genes? a. 78 map units P D UCD b. 42 map units c. 22 map units d. 20 map units e. 12 map units OU 22. What is the distance between proline auxotrophy gene and the centromere? a. 20 map units b., 12 map units c. 11 map units fd 0 map units de o map units

Explanation / Answer

The formula for finding the distance between a gene and Centromere is = 0.5*SECOND DIVISION SEGREGATION /TOTAL*100

That is second division segregation are the ones with the 2:2:2:2 or 2:4:2 type of second division segregation.

From this map unit between auxotrophic Proline gene and centromere = 0.5*20/100*100 that is 10 map unit.

I answer 0 that you are mentioning might not be correct because I don't see of that be possible.

So answer is 10 mapunits only

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