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(A) Let us analyze each statement:$(1)$ Mutations in germ cells are hereditary,so this statement is incorrect.$(2)$ Male $Drosophila$ flies do not exh

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$2$

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(A) Let us analyze each statement:$(1)$ Mutations in germ cells are hereditary,so this statement is incorrect.$(2)$ Male $Drosophila$ flies do not exhibit crossing over during meiosis,which is a well-known biological fact. This statement is correct.$(3)$ In honeybees,males (drones) develop from unfertilized eggs and are haploid $(n)$,while females are diploid $(2n)$. This statement is incorrect.$(4)$ $A$ frame-shift mutation involves the insertion or deletion of nitrogen bases,which shifts the reading frame. Replacing one base with another is a point mutation (substitution),not a frame-shift mutation. This statement is incorrect.$(5)$ Genes are the units of heredity and are responsible for the transmission of characters from parents to offspring. This statement is correct.Therefore,only statements $(2)$ and $(5)$ are correct. The total number of correct statements is $2$.

Column-$I$	Column-$II$
$(1)$ Inheritance of two genes	$(a)$ $ABO$ blood group
$(2)$ Incomplete dominance	$(b)$ $1:2:1$
$(3)$ Codominance	$(c)$ $9:3:3:1$
$(4)$ Inheritance of one gene	$(d)$ $3:1$

Similar Questions

Match the following:

Column-$I$ Column-$II$

$(1)$ Inheritance of two genes $(a)$ $ABO$ blood group

$(2)$ Incomplete dominance $(b)$ $1:2:1$

$(3)$ Codominance $(c)$ $9:3:3:1$

$(4)$ Inheritance of one gene $(d)$ $3:1$

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