Some species produce winged females in the summer, sometimes in response to low food quality or quantity.

The end product is four wigglers-male gametes, spermatozoa-half of whom can produce females; half, males.

Females and androgynes only carry genetic equipment for producing other females.

The result was a strain that would produce slow-feathering males and fast-feathering females.

If a species produces fewer females than males, daughters will be more fruitful than sons.

So, the theory goes, parents should produce females when helpers would be useful and males when they would not.

Why are they producing males and females in more or less equal numbers, which they are?

We just haven't produced enough females who have competed at the high school level.

Even by the period of the novels, certain bloodlines still produce sentient females, as do some, if not most, primitive tribes.