thylakoids
Chloroplasts contain saclike photosynthetic membranes called thylakoids, which are interconnected and arranged in stacks known as grana. Pigments are located in the thylakoid membranes. The fluid portion outside of the thylakoids is known as the stroma.
If you use a punnet sq. and cross the parents you see that all the children should be affected. by this thing represented by black.
Carbon Hydrogen and Oxygen