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19-Jun-2017 22:06 by 4 Comments

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Some bacteria use conjugation to transfer genetic material between bacteria.This is not the same as sexual reproduction, but it results in a similar mixture of genetic traits.

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Focus attention on what matters by pinning content and displaying at-a-glance views of key story events.For some species sex is not determined by inheritance, but instead by environmental factors experienced during development or later in life.Many reptiles have temperature-dependent sex determination: the temperature embryos experience during their development determines the sex of the organism.In many species they do not, except for the sex organs.Sex can be determined in different ways: Usually, sex is determined by an organism's genes.See Understanding the Ecosystem page for more information.

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This phenomenon is called sequential hermaphroditism. In clownfish, smaller fish are male, and the dominant and largest fish in a group becomes female.

In many wrasse the opposite is true—most fish are female at birth and become male when they reach a certain size.

If the baby gets one X and one Y, it will develop into a male.

There are occasional exceptions to this rule: the process of meiosis which makes the sex cells can go wrong.

Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male. Ferns which grow in soil which has previously supported hermaphrodites are influenced by hormones remaining to develop as male.