If you were referring to a cross between BB and Bb genotype then the answer would be 50%.
You can figure this out by making a Punnett Square.
B b
B BB Bb
B BB Bb
If you look at the result there is a chance that 2 out of the 4 will have a mixed genotype of Bb. The probability would then be 50%.
1. B A reduction in competition.
2. C. Respiratory system
Anthropology and sociology
Genetic Change in Viruses. Viruses are continuously changing as a result of genetic selection. They undergo subtle genetic changes through mutation and major genetic changes through recombination. Mutation occurs when an error is incorporated in the viral genome