Hi,
Attached is solution diagram. You can see that true breeding means both have same alleles for purple PP and white WW flowers.
They were crossed to produce hybrid plants that all had purple flowers PW because purple was the dominant trait.
However, upon self fertilization of those hybrid plants, both purple and white flower plants were produced in 3:1.
Hope it helps!
Answer:
At the microscopic level of a visceral muscle cell are actin and myosin filaments. They slide past each other in an antiparallel manner to shorten the distances between their ends. In a smooth muscle cell, the ends of chains of these functional units are attached to the cell membrane. They are several in a cell arranged in an elaborate framework. They contract together and deferentially to enable the muscle to contract as needed.
