question archive In Drosophila melanogaster (fruit fly), the genotypes homozygous for recessive allele rt (rotated abdomen) and st (scarlet) have misaligned segments and scarlet eye color phenotypes, respectively
In Drosophila melanogaster (fruit fly), the genotypes homozygous for recessive allele rt (rotated abdomen) and st (scarlet) have misaligned segments and scarlet eye color phenotypes, respectively
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In Drosophila melanogaster (fruit fly), the genotypes homozygous for recessive allele rt (rotated abdomen) and st (scarlet) have misaligned segments and scarlet eye color phenotypes, respectively. These genes were found to be linked. The testcross of rt st / + + resulted in 40 flies with misaligned segments that had scarlet eyes, 60 flies with normal segments and normal eye color, 12 flies with misaligned segments and normal eyes, and 7 flies with normal segments that had scarlet eyes. Estimate genetic distance in map units between rt and st:
A.19
B.10
C.12
D.7
E.16
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Answer is 16
Genetic distance =(Number of recombinants / Total number of progenies) x 100
={ (12 +7)/ (60 + 40 + 12 + 7)} x 100
= (19/119) x 100
= 15.9 mu = 16mu approximately
