Sex ratio is the

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(B) Sex ratio is defined as the ratio of males to females in a population.Types of Sex Ratio:In most species,the sex ratio varies according to the age

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Ratio of males to females

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(B) Sex ratio is defined as the ratio of males to females in a population.Types of Sex Ratio:In most species,the sex ratio varies according to the age profile of the population.It is generally divided into four sub-divisions:$(i)$ Primary sex ratio: Ratio at fertilization.$(ii)$ Secondary sex ratio: Ratio at birth.$(iii)$ Tertiary sex ratio: Ratio of sexually active organisms. It is also called adult sex ratio and abbreviated as $ASR$. $ASR$ is defined as the proportion of adults in a population that are male.$(iv)$ Quaternary sex ratio: Ratio in post-reproductive organisms.

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