Question

(a) State any one difference between pollination and fertilization.
​(b) A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits - blood group A or O is dominant? Why?

Answer 1

(a)

Pollination	Fertilisation
Pollination is the process of transfer of pollen from the anther of one flower to the stigma of the same flower or another flower.	Fertilisation is the process of fusion of male and female gametes.

b. No. The information provided above is not enough to tell us whether the trait of blood group A or O is dominant. Either of the two can be possible because each individual carries two alleles. Recessive traits can occur only when the two similar alleles are present.

There are two possibilities -

Possibility I - Blood group A is dominant and blood group O is recessive
In this case, the daughter can have either blood group A or O, if the mother and father have one allele of A and other of O blood group.

Possibility II - Blood group O is dominant and blood group A is recessive
In this case, the daughter can have blood group O, if the father carries both the alleles of blood group A while the mother has either both the alleles of blood group O or one of A blood group and other of O blood group.