Match the items of column $I$ with column $II$:

Column $I$	Column $II$
$(a) XX-XO$ method of sex determination	$(i)$ Turner's syndrome
$(b) XX-XY$ method of sex determination	$(ii)$ Female heterogametic
$(c)$ Karyotype $45$	$(iii)$ Grasshopper
$(d) ZW-ZZ$ method of sex determination	$(iv)$ Female homogametic

Select the correct option from the following:

The $HLA$ antigen present on human white blood cells is expressed by which chromosome?

Which of the following statements are false?
$I.$ $A$ dominant allele determines the phenotype when paired with a recessive allele.
$II.$ $A$ recessive allele is weaker than a dominant allele.
$III.$ $A$ recessive allele does not show its effects when paired with a dominant allele.
$IV.$ $A$ dominant allele is always better for an organism.

In a plant,three dominant genes $A$,$B$,and $C$ must be expressed together to produce purple flowers. If any one or all three genes are in the recessive state,the flowers become colorless.
Raw material $\xrightarrow{A} X \xrightarrow{B} Y \xrightarrow{C} Z$ (Pigment)
$A$ purple-flowered plant with genotype $AABBCC$ is crossed with a colorless plant with genotype $aabbcc$. This results in $F_1$ hybrid purple offspring. What will be the proportion of purple-flowered plants in the $F_2$ generation produced by selfing the $F_1$ generation?

Differentiate between a monohybrid cross and a dihybrid cross.

What is true for the expression of recessive characters?