A) male and female producing gametes
B) black and white
C) unisexual and bisexual
D) None of the above
Correct Answer: D
Solution :
The number of females in a population per 1000 males is called sex ratio. \[\text{Sex}\,\text{ratio=}\frac{\text{Number}\,\text{of}\,\text{females}}{\text{1000}\,\text{(males)}}\]
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