totipotency and cell specialisation

Question 1

facts

Answer 1

• all cells contain all the same genes

- but only certain genes are expressed in any one cell at any one time

Question 2

which genes are permenantly expressed in all cells

Answer 2

• genes that code for essential chemicals:

such as enzymes involved in respiration

Question 3

which genes are permenantly not expressed for cells

Answer 3

• the gene for insulin which is found in cells on the lining of the small intestine