A pea plant has purple flowers. Another pea plant has white (double recessive) flowers. The plants are crossed (bred together) and the resulting offspring are both colours with the phenotype ratio being 3:1 purple:white. What were the genotypes of the parents (G

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.