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If flies that are heterozygous for both the bent wing gene and the vestigial wing gene are mated, what is the probability of offspring with bent wings only?
a. 1/8
b. 3/8
c. 1/4
d. 9/16
e. 3/16

Respuesta :

W0lf93
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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