Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
$(a)$ Dominance
$(b)$ Co-dominance
$(c)$ Multiple allele
$(d)$ Incomplete dominance
$(e)$ Polygenic inheritance

Which of the following is true about linkage

$I.$ It is phenomenon in which more recombinants are produced in $F_{2}$-generation

$II.$ More parental combination are produced in $F_{2}$-generation

$III.$ Genotype which are present in $F_{1}$ hybrid. Reappear in high frequency in $F_{2}$-generation

$IV.$ It is a phenomenon in which two chromosome are linked

What is the correct sequence of the following events

$1.$Formation of the chromosome theory of heredity

$2.$Experiments which proved that $DNA$ is the hereditary material

$3.$Mendel's laws of inheritance-discovery

Code :

Match the Column - $I$ with $II$

Column - $I$	Column - $II$
$(a)$ Pleiotropic gene	$(i)$ Both allele express equally
$(b)$ Co-dominance	$(ii)$ Change in nucleotide
$(c)$ Epistasis	$(iii)$ One gene shows multiple phenotypic expression
$(d)$ Mutation	$(iv)$ Rust disease

Match the terms in column $I$ with their description in column $II$ and choose the correct option.

Column $-I$	Column $-II$
$(A)$ Dominance	$(i)$ Many genesgovern a single character
$(B)$ Codominance	$(ii)$ In a heterozygousorganism only one allele expresses itself
$(C)$ Pleiotropy	$(iii)$ In a heterozygousorganism both alleles express themselves fully
$(D)$ Polygenic	$(iv)$ A single gene inheritanceinfluences many characters

Choose correct answer :

$(i)$ Queen Elizabeth shows a number of haemophilic descendents.

$(ii)$ Variation in blood group prevalences due to incomplete dominance.

$(iii)$ Drosophila has three pairs of autosomal chromosomes.

$(iv)$ In birds, female is heterozygous.