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1993/11/01 Elhuyar Zientzia Iturria: Elhuyar aldizkaria

• Biologia

Female insects are very careful to choose the males that will fertilize. A Mexican butterfly, for example, assimilates many males, but in them only the strongest germinate, passing to the embryos the best genetic heritage.

Thomas Eisner from New York and Craig W from Arizona. According to researchers LaMunyon, the female conducts sperm to the eggs or out through the muscles of the genital tract.

Why do you pair with many males? Absorb some substances you receive along with the seed. Some of them are foods that ensure the strength and prosperity of the female. Others are the alkaloids collected by the males in the plants and the female lays them in the eggs to protect them from predators.

In addition, females can choose the fertilization male based on the number of alkaloids. When the male approaches, he takes out two small brushes full of alkaloids to attract the female.