Chromosome 1 (X) Chromosome 2 Chromosome 3 Chromosome 4 Bent wing Cubitus veins Net veins Aristaless antenna Star eyes Held-out wings Yellow body Scute bristles White eyes *Facet eyes Echinus eyes Ruby eyes Crossveinless wings Cut wings Singed bristles 0.0 0.2 -Shaven hairs Grooveless scutellum Eyeless 0.0 0.0- Roughoid eyes Veinlet veins 0.0-- 1.5 3.0 1.3 4.0 5.5 13.0 Dumpy wings 16.5 Clot eyes 7.5 13.7 19.2- - Javelin bristles 20.0 21.0 27.7-tLozenge eyes 26.0 Sepia eyes 26.5 Hairy body 33.0-.- 36.1-- Miniature wings Vermilion eyes 41.0 Dichaete bristles - Thread arista 43.0 44.0 Sable body Garnet eyes 43.2- Black body Reduced bristles Purple eyes Short bristles Light eyes Cinnabar eyes Scabrous eyes Vestigial wings Scarlet eyes Pink eyes Curled wings Stubble bristles Spineless bristles Bithorax body Striped body Glass body Delta veins Hairless bristles 48.5 44.0 51.0 48.0 56.7. 57.0-: 59.5--- Forked bristles Bar eyes Fused veins -Carnation eyes -Bobbed hairs 54.5 50.0 54.8 58.2 55.0 57.5 58.5 58.7 62.5- 66.0-. 66.7 62.0 67.0- 63.0 66.2 69.5 Lobe eyes Curved wings 72.0 75.5 70.7 Ebony body Cardinal eyes 74.7 91.1 Rough eyes 100.5 Plexus wings 100.7- - Claret eyes 104.5 107.0 Brown eyes Speck body 106.2 Minute bristles 7.15 Drosophila melanogaster has four linkage groups corresponding to its four pairs of chromosomes. HL |
Sepia eyes, spineless bristles, and striped body are three recessive mutations in Drosophila found on chromosome 3. A genetics student crosses a fly homozygous for the alleles encoding sepia eyes, spineless bristles, and striped body with a fly homozygous for the wild-type alleles—encoding red eyes, normal bristles, and solid body. The female progeny are then test-crossed with males that have sepia eyes, spineless bristles, and striped body. Assume that the interference between these genes is 0.2 and that 400 progeny flies are produced by the testcross. Based on the map distances provided in Figure , predict the
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 3 images