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cusskorneutran | 02 Јануар, 2019 18:12

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Alors, combien pour le sexe? This is called —the 0 indicates the absence of the sex chromosome. Species that have male and female members are called dioecious from the Greek for 'two houses'.

Egg cells are often associated with other cells which support the development of the embryo, forming an. Sometimes an organism's development is intermediate between male and female, a condition called. This is very frequent in plants.

Other animals have different , such as the in birds, the in insects, and various , for example in crustaceans. In the majority of species with sex specialization, organisms are either male producing only male gametes or female producing only female gametes. The penis contains a tube through which a fluid containing sperm travels. In many the opposite is true—most fish are initially female and become male when they reach a certain size. Each cell in the offspring has half the chromosomes of the mother and half of the father. Other plants have heavier, sticky pollen that is specialized for transportation by insects. Developmental Biology 6th ed.

En Yi Seks - In many cases, however, specialization of sex has evolved such that some organisms produce only male or only female gametes. Perverzne lezbijke obožavaju eksperimentirati sa svojom seksualnošću ravno pred Vama, jer se nemaju čega sramiti.

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