Number of females per 1000 males in the population is called _______.
Birth rate.
Death rate.
Growth rate.
Sex ratio.
A
Death rate.
B
Birth rate.
C
Growth rate.
D
Sex ratio.
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Solution
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Number of females per 1000 males in the population is called sex ratio.
The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be 1:1. This tendency is explained by Fisher's principle. For various reasons, however, many species deviate from anything like an even sex ratio, either periodically or permanently.
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