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.
Most mammals have only one pair of sex chromosomes in each cell. Males have one Y chromosome and one X chromosome, while females have two X chromosomes. In mammals, the Y chromosome contains a gene, SRY, which triggers embryonic development as a male.