The two main sources that lead to increased genetic variation are gamete mutations and recombination.
A gamete is the cell which combines with another cell during fertilization. So, its mutation can lead to variation in genes. Recombination as well, as the position of genes is changed.
Both ribosomes and the endoplasmic reticulum are found in the cell and are both organelles. The ribosomes make protein for the cell while the ER functions as a manufacturing and packaging system. Hope this helps! Good Luck on whatever you are doing!
Answer:
cells, tissues, organs, and systems
The iris is the circular structure in the eye; if the iris is blue, then the eyeball is considered to be blue.
