Thomas Hunt Morgan investigated linkage between the gene for purple eye color(pr) and the gene for vestigial wing. He first mated flies known to be pure breeding for purple eye and vestigial wing with wild type flies pure breeding for both traits. When Morgan mated female offspring from the cross with male pr vg / pr vg flies, he obtained the following results:
Phenotype
Genotype
Number observed
Wild type eye,
Wild type wing
1139
Wild type eye,
Vestigial wing
151
Purple eye(pr),
154
Purple eye, Vestigial wing
1195
total
2639
Are these loci linked? If yes, what is the distance between them?
For Morgan's data the map distance between the loci for purple eye color and vestigial wing is:
Thomas Hunt Morgan investigated linkage between the gene for purple eye color(pr) and the gene for vestigial wing. He first mated flies known to be pure breeding for purple eye and vestigial wing with wild type flies pure breeding for both traits. When Morgan mated female offspring from the cross with male pr vg / pr vg flies, he obtained the following results:
| Phenotype
| Number observed |
| Wild type eye, | 1139 |
| Wild type eye, | 151 |
| Purple eye(pr), | 154 |
| Purple eye, Vestigial wing | 1195 |
| total | 2639 |
Are these loci linked? If yes, what is the distance between them?
For Morgan's data the map distance between the loci for purple eye color and vestigial wing is:
Related textbook solutions
Related questions
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.
