If flies that are heterozygous for both the bent wing gene and the vestigial wing gene are mated, what is the probability of off spring with bent wings only? a. 1/8
b. 3/8
c. 1/4
d. 9/16
e. 3/16
1 answer:
E.3/16 Vg: normal wings; vg: vestigial wings Bt: normal wings, bt: bent wings But to simplify, I write: V: normal wing; v: vestigial wing B: normal wings; b: bent wings P: VvBb x VvBb Gametes (both) VB, Vb, vB, vb F1 (Punnett Square) .....|.... VB...|...Vb...|...vB...|..vb VB | VVBB | VVBb | VvBB | VvBb Vb | VVBb .| VVbb | VvBb | Vvbb vB | VvBB ..| VvBb | vvBB | vvBb vb | VvBb ..| Vvbb. | vvBb | vvbb Phenotypic ratio: 9/16 V-B- (normal) : 3/16 V-bb (bent) : 3/16 vvB- (vestigial) : 1/16 vvbb (vestigial-bent)
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