A gene in a fruit flies controls wing shape. The wings can be either normal or vestigial. A second gene controls eye color which can be either red or purple. Pure-breeding red-eyed, normal winged flies were crossed with pure-breeding purple-eyed, vestigial winged flies and all of the F1 were red-eyed with normal wings. Some of these F1 individuals were backcrossed to the purple-eyed, vestigial winged line and the following phenotypes were obtained in the F2:
285 red eyes, normal wings
215 red eyes, vestigial wings
198 purple eyes, normal wings
278 purple eyes, vestigial wings
If you were to run a Chi-squared test to see if these results support the hypothesis that these two genes represent independently assorting Mendelian units (i.e. that they are not linked), what would the expected ratio of the four offspring phenotypic classes be?
A gene in a fruit flies controls wing shape. The wings can be either normal or vestigial. A second gene controls eye color which can be either red or purple. Pure-breeding red-eyed, normal winged flies were crossed with pure-breeding purple-eyed, vestigial winged flies and all of the F1 were red-eyed with normal wings. Some of these F1 individuals were backcrossed to the purple-eyed, vestigial winged line and the following phenotypes were obtained in the F2:
285 red eyes, normal wings
215 red eyes, vestigial wings
198 purple eyes, normal wings
278 purple eyes, vestigial wings
If you were to run a Chi-squared test to see if these results support the hypothesis that these two genes represent independently assorting Mendelian units (i.e. that they are not linked), what would the expected ratio of the four offspring phenotypic classes be?
Related textbook solutions
Related questions
Questions 9-15 are related. The drosophila alleles for purpleeyes (instead of red) and dumpy wings (instead of normal) are bothrecessive. Gene âEâ designates eye color (E: dominant, e:recessive), and gene âDâ designates wing shape (D: dominant, d:recessive). You cross a pure breeding purple eyed, normal wingedfly to a true breeding red eyed, dumpy winged fly.
9. What are the genotypes of the parental flies? (select allthat apply)
| EEDD |
| EEDd |
| EEdd |
| EeDD |
| EeDd |
| Eedd |
| eeDD |
| eeDd |
| eedd 10. What would you expect the offspring (F1) phenotypes tobe?
|
