Which of the following is genetically dominant in man?

Blood group of a person is $A$ and he is suffering from albinism. What percentage of his gametes will have genotype $I^A a$?

For obtaining a hybrid ratio,which characters of the plant are taken into account?

Which of the following is the significance of dominance?

Choose the correct option for the given descriptions:
$(i)$ The heterozygous female transmits the disease to the son.
$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle-like structure.
$(iii)$ Mentally retarded.
$(iv)$ Haemoglobin is not formed in the proper amount in the blood.

Differences in twins suggest