The father has blood group $AB$ and the mother has blood group $O$. Which of the following blood groups can the child have?

When two genetic loci produce identical phenotypes in both $cis$ and $trans$ configurations,they are considered to be:

Variation stands for differences in traits of progenies from

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.

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$(a)$ Gain or loss of nitrogen base	$(i)$ Aneuploidy
$(b)$ Gain or loss of segment of $DNA$	$(ii)$ Frame shift
$(c)$ Gain or loss of whole set of chromosome	$(iii)$ Euploidy
$(d)$ Gain or loss of one chromosome	$(iv)$ Chromosomal aberration

$A$: Antlers in male deer are sex-influenced traits.
$R$: These are controlled by autosomal genes which are influenced by the sex of the bearer.