6 Genotype Mixes

Question 1

If both parents are dominant

Answer 1

BBxBB Ratio: 4:0

  B      B B   BB  BB B   BB  BB

BBxBb Ratio: 4:0

  B      B B   BB  BB b   Bb   Bb

BbxBb Ratio: 3:0

  B      b B   BB  Bb b   Bb  Bb

Question 2

If both parents are recessive

Answer 2

b b
b bb bb
b bb bb

0:4 ratio BBxbb

Question 3

One dominant and one recessive

Answer 3

1. BBxbb

Ratio 4:0

 B    B b  Bb   Bb b  Bb   Bb

2. Bbxbb

Ratio 2:2

 B      b b  Bb   bb b  Bb   bb

Question 4

How it works

Answer 4

Uppercase=dom
Lowercase=rec

Upper right: heterozygous
Lower right: homozygous