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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?

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Jamar Ferry
Jamar FerryLv2
28 Sep 2019

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Related questions

True-breeding brown-eyed, short-winged female flies are crossed to true-breeding wild-type male flies with red eyes and long wings. The F1 progeny consists of wild-type females and short-winged males. An F2 is generated by interbreeding of the F1. F2 males and females have the following ratios: 3/8 red eyes, long wings 3/8 red eyes, short wings 1/8 brown eyes, long wings 1/8 brown eyes, short wings Deduce the mode of inheritance for both the eye color and wing length genes. Using clear genetic symbols, state the genotypes and describe the phenotypes of the P, F1 and F2 progeny. For the F2, include a table of genotypes of gametes of both parents and progeny genotypes and corresponding phenotypes. Would you predict that these genes are on the same chromosome?

1. The eye color of wild-type Drosophila flies is red. Differentmutations in a single or in multiple genes lead to flies with whiteeyes. Mutations in the w gene on the X chromosome lead to whiteeyes instead of the normal red. You have isolated both a white-eyedmutation (designated W-1) that gives a dominant phenotype, and awhite-eyed mutation (designated w-2) that gives a recessivephenotype.

(a) A white-eyed male from the W-1 line is crossed to awild-type female. What color eyes will the female progeny from thiscross have?

(b) What color eyes will the male progeny from the cross in part(a) have?

(c) One of the female progeny from the cross in part (a) ismated to a white-eyed male from the w- 2 line. What fraction of thewhite-eyed progeny from this cross will be female?

2. The body color of Drosophila adult flies is regulated bymultiple genes, including the autosomal ebony gene. Ebony body (e)is recessive to the wild type (yellowish) body (e+). A second gene,which is X-linked, controls bristle shape. Normal bristle shape(f+) is dominant to the mutant forked bristles (f). A female withforked bristles that is heterozygous for the body color gene ismated with an ebony body male (his bristles are normal).

(a) What are the genotypes of the parents?

(b) Using a Punnett square, determine the expected proportionsof each possible progeny phenotype. Since there is a sex-linkedgene here, be sure to include consider sex as part of thephenotype.

3. Describe in your own words what a balancer chromosome is andwhy it is important in fly genetics (you will have to do someresearch for this one!)

Questions 9-15 are related. The drosophila alleles for purpleeyes (instead of red) and dumpy wings (instead of normal) are bothrecessive. Gene “E” designates eye color (E: dominant, e:recessive), and gene “D” 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?

All purple eyed, dumpy winged
All red eyed, normal winged
All purple eyed, normal winged
All red eyed, dumpy winged
Half purple eyed normal winged, half red eyed dumpy winged
Half red eyed normal winged, half purple eyed dumpy winged

None of the above

11. You cross these F1 offspring to flies that are pure breedingfor purple eyes and dumpy wings. You get 200 offspring. 45 arepurple eyed and dumpy winged, 43 are red eyed and normal winged, 63are purple eyed and normal winged, and 49 are red eyed and dumpywinged. You think that these two genes could be on differentchromosomes but your friend tells you that he thinks they arelinked and that they are close enough to each other to have afrequency of recombinants of 0.38. If you are correct and they areon different chromosomes, how many purple eyed, normal winged flieswould you ideally expect out of your 200 offspring? Youranswer should be a whole number.

12. If your friend is correct and the genes are linked withfrequency of recombinants of 0.38 how many purple eyed, normalwinged flies would you expect? Your answer should be awhole number

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