Represented below is the inheritance pattern of a certain type of trait in humans. Which one of the following conditions could be an example of this pattern?

Which of the following statements is correct?

The $F_2$ dihybrid ratio $9 : 3 : 4$ is explained on the basis of

In humans, albinism is controlled by a recessive gene '$a$'. If both parents are known to be carriers $(Aa)$ for albinism, what is the probability of having $1$ normal and $3$ albino children in a family of $4$ (in $/256$)?

Differentiate between the following:
$(a)$ Dominant and Recessive
$(b)$ Homozygous and Heterozygous
$(c)$ Monohybrid and Dihybrid.

Consider the following statements regarding the $ABO$ blood group in humans:
$I.$ It is controlled by multiple alleles.
$II.$ It shows codominance.
$III.$ Codominance can be manifested phenotypically in humans.
$IV.$ It follows Mendel's law of inheritance.
Which of the following statement$(s)$ are correct?