A male fruit fly with red eyes and short wings is mated to afemale with brown eyes and long wings. All the F1 offspring arered-eyed and long winged. The F1 are intercrossed to produce andF2. The F2 show the following phenotypes
6/16 red-eye, long-wing female
3/16 red eye-long wing male
3/16 red eye-short wing male
1/16 brown eye, long wing male
1/16 brown eye, short wing male
Which forms are dominant? What are the genotypes of the parentsand the F1 females and males?
What are the possible genotypes of each F2 progeny?
A male fruit fly with red eyes and short wings is mated to afemale with brown eyes and long wings. All the F1 offspring arered-eyed and long winged. The F1 are intercrossed to produce andF2. The F2 show the following phenotypes
6/16 red-eye, long-wing female
3/16 red eye-long wing male
3/16 red eye-short wing male
1/16 brown eye, long wing male
1/16 brown eye, short wing male
Which forms are dominant? What are the genotypes of the parentsand the F1 females and males?
What are the possible genotypes of each F2 progeny?
Related textbook solutions
Related questions
In Drosophila, bodies can be ebony colored (e), double wings canbe produced (d), and eyes can be red (r). These three genes arelinked on the same chromosome. Females from a pure-breeding ebonybodies, double winged, and red eyes are crossed with males from awild type stock. The F1 are wild type for all three traits. The F1females are then crossed with males that are ebony bodied, doublewinged, and red eyed.
| double wing, red eye | 76 |
| wild | 350 |
| ebony body | 81 |
| double wing | 82 |
| ebony body, red eye | 77 |
| ebony body, double wing, red eye | 330 |
| red eye | 4 |
a) Construct a chromosomal map with the correct gene order anddistance between each pair of genes.
b) What are the genotypes (in correct gene order) for theoriginal parents?
c) What are the genotypes (in correct gene order) for the F1individuals?
Genetics In a hypothetical insect species, eye color may be purple or red, and wings may be long or short. The following table shows the results of two crosses where the parents were obtained from a mixed population that did not breed true.
| Parents | Progeny | |
| Cross 1 | Red long male Red, long female | Males: one half red, long; one half purple long Females: all red, long |
| Cross 2 | Red short male Purple long female | Males, all purple short Females: all red eyed, short |
What is the mode of inheritance for eye color for this insect?
What is the mode of inheritance for wing size?
Assuming that true breeding lines are used which of the following crosses would produce an F2 generation that confirms the mode of inheritance for both traits?
Purple short male X red long female
Red short male X red short female
What phenotypic ratio would you expect to see in the F2 generation?
males: 9/16 red, short; 3/16 purple, short; 3/16 red, long; 1/16 purple, long; females: 9/16 red, short; 3/16 purple, short; 3/16 red, long; 1/16 purple, long
males: 3/4 red, short; 1/4 red, long; females: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long
males: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long; females: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long
males: 3/8 red, short; 3/8 purple, short; 1/8 red, long; 1/8 purple, long females: 3/4 red, short; 1/4 red, long
