Alleles A and sigma are at a locus on the same chromosome as

Alleles A and sigma 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 aa Bb aa bb Based upon these data, what is the arrangement of the genes on the chromosome in the Aa Bb parent? Write out the cross using appropriate annotation, and indicate if the alleles in the heterozygote are arranged in the cis (coupling) or trans (repulsion) configuration.

Solution

Answer:

Based on the large number of progeny are parental combinations= Aa bb & aa Bb

Recombianant progeny are Aa Bb & aa bb.

The arrangement of the genes in parent AaBb is Ab/aB, trans(repulsion) configuration.

Ab/aB x ab/ab---Parents

	ab
Ab	Ab/ab (Non-Recombinant)
aB	aB/ab (Non-Recombinant)
AB	AB/ab (Recombinant)
ab	ab/ab (Recombinant)