Directions: Complete the following Dihybrid Cross problems.Betta-fish

  • Identify the gametes from each parent.
  • Complete a Punnett Square for the cross
  • Identify the genotypes and phenotypes for the potential offspring.
  • Find the phenotypic ratio for the potential offspring.

Betta (Chinese/ Siamese fighting fish) Characteristics [Upper Case= Dominant & Lower Case= Recessive]

B= Blue Tail                                                         b= black Tail

V= Veil Tail                                                          v= Crown Tail

M= Metallic Sheen                                          m= No Metallic Sheen

F= Short Pectoral Fins (Normal)                 f= Long Pectoral Fins (Elephant Ears)

C= Colored Body                                                 c= White Body

Parent Cross 1

BbVv x BBvv

Answer:

BV Bv bV bv
Bv BBVv

Blue tail; veiled tail

BBvv

Blue tail; crown tail

BbVv

Blue tailed; veiled tail

Bbvv

Blue tail; crown tail

Bv BBVv

Blue tail; veiled tail

BBvv

Blue tail; crown tail

BbVv

Blue tail; veiled tail

Bbvv

Blue tail; crown tail

Bv BBVv

Blue tail; veil tail

BBvv

Blue tail; crown tail

BbVv

Blue tail; veil tail

Bbvv

Blue tail; crown tail

Bv BBVv

Blue tail; veil tail

BBvv

Blue tail; crown tail

BbVv

Blue tail; veil tail

Bbvv

Blue tail; crown tail

 

Parent Cross 2

BbMM x bbMm

Answer:

BM BM bM BM
bM BbMM

Blue tail; metallic

BbMM

Blue tail; metallic

bbMM

black tail; metallic

BbMM

Blue tail; metallic

bm BbMm

Blue tail; metallic

BbMm

Blue Tail; metallic

bbMm

black tail; metallic

BbMm

Blue Tail; metallic

bM BbMM

Blue Tail; metallic

BbMM

Blue Tail; metallic

bbMM

Black tail; metallic

BbMM

Blue Tail; metallic

bm BbMm

Blue Tail; metallic

BbMm

Blue Tail; metallic

bbMm

black tail; metallic

BbMm

Blue Tail; metallic

 

Parent Cross 3

Vvff x VvFf

Answer:

Vf Vf Vf vf
VF VVFf

Veil tail; Short pectoral

VVFf

Veil tail; Short pectoral

VVFf

Veil tail; Short pectoral

VvFf

Veil tail; Short pectoral

Vf VVff

Veil tail; long pectoral

VVff

Veil tail; long pectoral

VVff

Veil tail; long pectoral

Vvff

Veil tail; long pectoral

vF VvFf

Veil tail; Short pectoral

VvFf

Veil tail; Short pectoral

VvFf

Veil tail; Short pectoral

vvFf

Crown tail; long pectoral

vf Vvff

Veil tail; long pectoral

Vvff

Veil tail; long pectoral

Vvff

Veil tail; long pectoral

vvff

Crown tail; long pectoral

 

 

Parent Cross 4

bbcc x BBCc

Answer:

bc bc bc bc
BC BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

Bc BbCc

Blue tail; colored body

Bbcc

Blue tail; white body

Bbcc

Blue tail; white body

Bbcc

Blue tail; white body

BC BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

BbCc

Blue tail; colored body

Bc Bbcc

Blue tail; white body

Bbcc

Blue tail; white body

Bbcc

Blue tail; white body

Bbcc

Blue tail; white body

 

Parent Cross 5

CCff x CcFf

Answer:

Cf Cf Cf Cf
CF CCFf

Colored body; short pectoral

CCFf

Colored body; short pectoral

CCFf

Colored body; short pectoral

CCFf

Colored body; short pectoral

Cf CCff

Colored body; long pectoral

CCff

Colored body; long pectoral

CCff

Colored body; long pectoral

CCff

Colored body; long pectoral

cF CcFf

Colored body; short pectoral

CcFf

Colored body; short pectoral

CcFf

Colored body; short pectoral

CcFf

Colored body; short pectoral

cf Ccff

Colored body; long pectoral

Ccff

Colored body; long pectoral

Ccff

Colored body; long pectoral

Ccff

Colored body; long pectoral

 

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