Noah developed a model to show how genes are acquired by offspring in sexual reproduction: He used two paper bags, one to represent each parent.
He placed two slips of paper representing alleles into each paper bag.
To show the transmission of alleles, he selected one of the paper bags, and took both slips of paper from that bag to represent the alleles passed to the offspring.

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell