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Dating practices vary from culture to culture, but before people get married, they usually date or go out together for a period of time to see if they are compatible.

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A temperature-dependent sex determination system is found in some reptiles.All animals have a set of DNA coding for genes present on chromosomes.In many species, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology.

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It can be difficult to determine the sex of a small kitten since the organs are not immediately visible like that of a puppy.

A male puppy's penis is perfectly visible from the moment of birth, while the penis of a male kitten will not begin to show until he is approximately 6 to 10 weeks old.

With there being little, if any, physical definition in the genital region of a small kitten, it can be hard to distinguish males from females.

Determining the sex requires close observation of the subtleties of the animal's physical anatomy, since it is determined by the distance between the kitten's anus and sexual organ; you will need to lift your cat's tail gently to view the area.

The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects (Drosophila), and some plants (Ginkgo).

In this system, the sex of an individual is determined by a pair of sex chromosomes (gonosomes).

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In humans, most mammals, and some other species, two of the chromosomes, called the X chromosome and Y chromosome, code for sex.

In these species, one or more genes are present on their Y-chromosome that determine maleness.