1. Mating: Male mice have a penis that they use to deposit sperm into the female mouse's vagina.
2. Fertilization: The sperm travels through the female's reproductive tract and fertilizes an egg in the fallopian tubes.
3. Implantation: The fertilized egg, now called a zygote, travels down the fallopian tube and implants itself in the wall of the uterus.
4. Gestation: The embryo grows and develops inside the uterus for a gestation period of about 19-21 days.
5. Birth: After the gestation period, the mother mouse gives birth to a litter of pups.
Here are some additional details:
* Ovulation: Female mice release an egg, called ovulation, around every 4-5 days. They are most fertile during this period.
* Sperm: Male mice can produce millions of sperm cells, which can live for up to 24 hours inside the female's reproductive tract.
* Litter size: Mice can have litters of 4 to 12 pups.
* Multiple pregnancies: Mice can become pregnant again very quickly after giving birth, even within a few days.
It's important to remember that while this is a basic explanation, the process of pregnancy is complex and involves a variety of hormones and physiological processes.