Page 17 - Genetics_FULL

BB x Bb Cross Phenotype Genotype

Black fur
Bb
The offspring in this Punnett square have two different genotypes,
but all have the same phenotype. Bb
Black fur BB
Phenotype Genotype B b

Black fur Bb
Black fur BB Bb
B B
B b B B b

BB
B B B B b B B B b
B

BB

B B B B b

Bb x Bb Cross Phenotype Genotype

Bb
Black fur
For this cross there are three possible genotypes and two possible
phenotypes. Bb
Black fur BB
White fur
Phenotype Genotype bb B b

Black fur Bb
Black fur BB Bb

B b
White fur bb B B B B b

You could predict that 75% of the Bb
offspring would have black fur, and 25%
B B
white fur. This is the same percentage B B b
that Mendel observed when crossing the b B b b b
F1 generations of pea plants.
Bb

b B b b b

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