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This science fair project was conducted to ascertain the dominant gene amongst black and white colored mice . The science fair project involved an experiment of breeding mice of different color combinations. .


We hypothesize that the white mouse has the the dominant gene.

Scientific Terms

Genes, gravidity, breeding


Laboratory mice

White mice were first bred and kept as pets in China and Japan around 1100 BC. They were preferred as pets because of their small size. They enjoy gentle handling and are fairly easy to rear as pets. A regular mouse is about 35 grams in weight and 17 cm in length from nose to tail. The average life-span of a mouse is about 2 years.

Mice can be kept and bred in simple cages. They will take about 3 months to grow into full adults. One male can be bred with as many as six female mice. Beyond this, the community gets a little too crowded and the mice may start turning on each other. Each mouse can give birth to between 4 and 11 babies at a time, after 18 to 21 days of pregnancy. The hair of young mice typically starts to grow after 3 days.

Mice can be bred to have coats of different colors like white, black, brown or blue, and their coats can be spotted or marbled. The color of their coats will be determined by 4 types of genes as follows:

  1. A - agouti , a – non-agouti
  2. B – black, b – brown
  3. C – color, c – albino
  4. D – non-dilute, d – dilute
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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 35 days for the science project experiment
Material availability:
Mice may be purchased at a pet store
Safety concerns:

Handle the mice carefully and was your hands after handling.