The correct option is
A I- B, II- C, III- A, IV- DGenetics is the study of heredity and the variation of inherited characteristics.
Punnet square in genetics is a type of grid used to show the gametes of each parent and their possible offspring.
Haploid is an organism or cell having only one complete set of chromosomes, ordinarily half the normal diploid number.
Allele is two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
So, the correct answer is option A.