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.
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.
This information is not meant to be a substitute for veterinary care.
Always follow the instructions provided by your veterinarian.
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