What will be possible blood group in children from the parents with $B$ and $AB$ blood groups?

One of the following is not the types of blood groups or blood factors

Nicotiana sylvestris flowers only during long days and $N$.tabacum flowers only during short days, if raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self-fertile offspring. What is the best reason for considering $N .$ sylvestris and $N$. tobaccum to be separate species?

In man the mutation disease ‘Aniridia' $(Congenital\, absence \,of\, iris)$ occurs due to

A black hybrid mouse is crossed with a pure brown mouse to produce a total of $24$ young ones. Which of the following result is most likely to be correct