MCQ
Sex ratio is the
- ARatio of females to males
- ✓Ratio of males to females
- CBoth $(a)$ and $(b)$
- DRatio of infant girl to infant boy
Types of Sex Ratio
In most species, 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 fertilisation
$(ii)$ Secondary sex ratio $-$ Ratio of birth
$(iii)$ Tertiary sex ratio $-$ Ratio of sexually active organisms. Also called adult sex ratio and abbreviated to $ASR.$ $ASR$ 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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