Most scientific investigations use some form of the scientific method. Find out more about the scientific method. Science as defined above is sometimes called pure science to differentiate it from applied science, which is the application of research to human needs.
There are 13 chromosomes in a frog gamete and 26 in a frog body cell.
In the case of humans, this means that parent cells have two chromosomes and gametes have one. During fertilization, gametes from the sperm combine with gametes from the egg to form a zygote. The zygote contains two sets of 23 chromosomes, for the required 46. All of the gametes in the motherâs eggs possess X chromosomes. The fatherâs sperm contains about half X and half Y chromosomes. The sperm are the variable factor in determining the sex of the baby.