2. In Drosophila, the genes b (black body), vg (vestigial wings), and c (curved wings) are...
2. In Drosophila, the genes b (black body), vg (vestigial wings), and c (curved wings) are linked. The genes are in the order vg-b-c. Shown here is the genotypic arrangement in a heterozygous fly:
vg- b+c+
=====
vg+ b c-
a. Indicate all of the different gamete genotypes that could arise from this parent.
b. What two gamete genotypes will be made in the highest frequency from this heterozygote?
c. What two gamete genotypes will be made in the lowest frequency from this heterozygote?
Homework Answers
Ans A) 6 types of gametes can be form due to the cross between the parents vg- b+c+ // vg+ b c-
The gametes are 1) vg+ b+ c+ (2) vg-b c- (3) vg+ b+ c- (4) vg- b c+ (5) vg- b+c- (6) vg+ b c+
Ans B) The two gametes which could form heighest frequency are the single cross over between 1) vg+ b+ c+ (2) vg-b c- or (5) vg- b+c- (6) vg+ b c+
Ans C) The two gametes which could form lowest frequency are the double cross over between (4) vg- b c+ (5) vg- b+c-. The double cross over occur by the transfer of middle allele present in the linkage. The double cross over occur very least in term of frequency.
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2. In Drosophila, the genes b (black body), vg (vestigial
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