One of the evolutionary "enigmas," or unsolved puzzles, of sexual reproduction is due to the fact that

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In sexual reproduction, offspring inherit half of their genetic material from each parent, resulting in males and females. This means that only half of the offspring from sexually reproducing females are also females, which may seem like a waste of reproductive effort since only females can produce offspring. This is known as the "anisogamy enigma" and is an unsolved puzzle in evolutionary biology.

One of the Evolutionary "Enigmas," or Unsolved Puzzles, of Sexual