(Problem 13) Alleles A and a are at a locus on the same chromosome as is a locus
ID: 93966 • Letter: #
Question
(Problem 13) Alleles A and a are at a locus on the same chromosome as is a locus with alleles B and b. Aa Bb is crossed with aa bb and the following progeny are produced:
Aa Bb × aa bb progeny
Aa Bb 5
Aa bb 45
aa Bb 45
aa bb 5
What conclusion can be made about the arrangement of the genes on the chromosome in the Aa Bb parent?The genes are ___________, and the map distance between them is ____________. A. unlinked; 0 map units B. in coupling configuration; 5 map units C. in repulsion; 10 map units D. in coupling configuration; 10
Explanation / Answer
Answer:-
Option"c"-in repulsion,10 map units.
Explanation:-The results of this testcross reveal that Aa bb and aa Bb, with far greater numbers, are the progeny that received nonrecombinant chromatids from the Aa Bb parent. ***Given that all the progeny received ab from the aa bb parent, the nonrecombinant progeny received either an Ab or an aB chromatid from the Aa Bb parent.
**Therefore, the A and B loci are in repulsion in the Aa Bb parent.
**Aa Bb and aa bb are the recombinant classes, and their frequencies indicate that the genes A and B are 10 m.u. apart.
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