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.
If all the DNA strands in the human body were laid end to end, they would form a very thin strand about 6 billion miles long. The complexity of the organism usually predicts the number of genes and chromosomes. A frog, for example, has 26 chromosomes, or 13 pairs, while a human being has 46 chromosomes, or 23 pairs. Human chromosomes range from 300 genes to 8,000 genes in size. Chromosomes are paired as the offspring receives one from each parent.