The main objective of this activity os to help you practice how to make a dihybr
ID: 201266 • Letter: T
Question
The main objective of this activity os to help you practice how to make a dihybrid cross.
The following alleles describe the different physical traits in cockroaches from New Zealand:
Brown color (B) beige color (b)
Long legs (L) short-legs (l)
Long wings (W) short wings (w)
Ability to fly (F) unable to fly (f)
Using the Ability to fly (W) and (w) and color alleles (B) and (b), fill in the Punnett square below for the possible outcomes from a dihybrid cross of mom (WwBb) and dad (WwBb). Please be sure to label the phenotype of each potential offspring and write the ratio for the different phenotypes on the side (12 points).
Ratios
Explanation / Answer
Here, Gamete formation will be
Mom: WB, Wb, wB, and wb
Dad: WB, Wb, wB, and wb
Female
male
WB
Wb
wB
wb
WB
WWBB
Long wings, Brown color
WWBb
Long wings, Brown color
WwBB
Long wings, Brown color
WwBb
Long wings, Brown color
Wb
WWBb
Long wings,
Brown color
WWbb
Long wings, beige color
WwBb
Long wings, Brown color
Wwbb
Long wings, beige color
wB
WwBB
Long wings, Brown color
WwBb
Long wings, Brown color
wwBB
short wings, Brown color
wwBb
short wings, Brown color
wb
WwBb
Long wings, Brown color
Wwbb
Long wings, beige color
wwBb
short wings, Brown color
Wwbb
short wings, beige color
Long wings, Brown color = 9
Long wings, beige color=3
short wings, Brown color =3
short wings, beige color =1
Therefore ratio is 9:3:3:1
Female
male
WB
Wb
wB
wb
WB
WWBB
Long wings, Brown color
WWBb
Long wings, Brown color
WwBB
Long wings, Brown color
WwBb
Long wings, Brown color
Wb
WWBb
Long wings,
Brown color
WWbb
Long wings, beige color
WwBb
Long wings, Brown color
Wwbb
Long wings, beige color
wB
WwBB
Long wings, Brown color
WwBb
Long wings, Brown color
wwBB
short wings, Brown color
wwBb
short wings, Brown color
wb
WwBb
Long wings, Brown color
Wwbb
Long wings, beige color
wwBb
short wings, Brown color
Wwbb
short wings, beige color
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