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

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.

Mletački izvori spominju mađarske prodore sve do mora, što bi zasigurno značilo da je u određenom periodu u Hrvatskoj došlo do masovnog sukoba.

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Many reptiles have temperature-dependent sex determination: the temperature embryos experience during their development determines the sex of the organism.

In some turtles, for example, males are produced at lower incubation temperatures than females; this difference in critical temperatures can be as little as 1-2 °C.

In humans, for instance, sperms carry either an X or a Y chromosome, and they occur in roughly equal numbers.

For some species sex is not determined by inheritance, but instead by environmental factors experienced during development or later in life.

Sexual reproduction first appeared about a billion years ago. Sexual reproduction is a process that can only be found in eukaryotes. There are other kinds of organisms (other than animals, plants and fungi), the other eukaryotes – such as the malaria parasite – that also engage in sexual reproduction.

Some bacteria use conjugation to transfer genetic material between bacteria.Once it is in, a fast reaction goes through the egg cell wall to shut off all other sperm.Sex determination in biology is about the function of sex, not what individuals look like.Sex can be determined in different ways: Usually, sex is determined by an organism's genes.With genetic sex determination, most alleles or genes that influence sexual development are on the same chromosome. Because genetic sex determination is controlled by a pair of sex chromosomes (or by the presence or absence of one of the chromosomes), there are usually the same number of male and female offspring.This is not the same as sexual reproduction, but it results in a similar mixture of genetic traits.

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