Scalloped (sd) wing is an X-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.
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In Drosophila, a female fly is heterozygous for threemutations, Bar eyes (B), miniature wings (m), andebony body (e). That female is crossed to a male withnormal eyes, miniature wings, and ebony body. The results of thecross are shown in the table below.
Prior to obtaining the above results you crossed a true-breedingBar eye male to a true-breeding female with miniature wings andebony body. All F1 males were miniature wings and all F1 femaleshad Bar eyes.
Is Bar eyes, sex-linked or autosomal?
Are miniature wings, sex-linked or autosomal?
Is ebony body, sex-linked or autosomal?
miniature | 111 | Bar | 117 |
wild | 29 | Bar, miniature | 26 |
Bar, ebony | 101 | ebony | 35 |
Bar, miniature, ebony | 31 | miniature, ebony | 115 |
In Drosophila, the gene for bar-shaped (B) eyes and the gene for scalloped wings (sc) are linked on the X-chromosome. (The normal or wild type eye shape is oval, and the wild type wing is rounded.) Heterozygous, bar-eyed females were mated to homozygous, scalloped-wing males. The offspring are as follows:
| phenotype | female | male |
| scallop | 183 | 186 |
| bar | 189 | 188 |
| wild type | 12 | 10 |
| scallop & bar | 9 | 12 |
-What is the map distance between the two genes?
-Give the exact phenotypes of the F1 flies.
