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(C) In Drosophila,sex determination is based on the ratio of the number of $X$ chromosomes to the number of sets of autosomes ($X/A$ ratio).$1$. If th

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$3A + XXY$

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(C) In Drosophila,sex determination is based on the ratio of the number of $X$ chromosomes to the number of sets of autosomes ($X/A$ ratio).$1$. If the $X/A$ ratio is $1.0$,the individual is a female.$2$. If the $X/A$ ratio is $0.5$,the individual is a male.$3$. If the $X/A$ ratio is between $0.5$ and $1.0$ (e.g.,$0.67$),the individual is an intersex.For option $C$ $(3A + XXY)$: The number of $X$ chromosomes is $2$ and the number of sets of autosomes is $3$. The ratio is $2/3 \approx 0.67$. Since this value lies between $0.5$ and $1.0$,it represents an intersex individual.

Column-$I$	Column-$II$
$(P)$ $(X+O)$	$(i)$ Genetic constitution in Drosophila
$(Q)$ $(XX+XY)$	$(ii)$ Genetic constitution in grasshopper
$(R)$ $(ZZ+ZW)$	$(iii)$ Sex determination in birds
$(S)$ $(AA+XX)$	$(iv)$ Sex determination in humans

Which of the following genotypes represents an intersex individual in Drosophila?

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$A$ male child would be born to parents if

Give differences: Male heterogamety and Female heterogamety.

Match the following columns:
Column-$I$ Column-$II$
$(P)$ $(X+O)$ $(i)$ Genetic constitution in Drosophila
$(Q)$ $(XX+XY)$ $(ii)$ Genetic constitution in grasshopper
$(R)$ $(ZZ+ZW)$ $(iii)$ Sex determination in birds
$(S)$ $(AA+XX)$ $(iv)$ Sex determination in humans

$A$: One drumstick per nucleus is present in the neutrophil of a normal female.
$R$: It is absent in the neutrophil of a male.

The genic balance theory of sex determination was proposed by:

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