First he pollinated  short pea plants with tall pea plants. T â¦ he next generation of pea  plants resulting from the expiriment were all tall pea plants. He  bred two of the pea plants from thhe new generation and they ended  up having 3 tall pea plants and 1 short pea plant.
Intercostal muscles are several groups of muscles that run between the ribs, and help form and move the chest wall. The intercostal muscles are mainly involved in the mechanical aspect of breathing.These muscles help expand and shrink the size of the chest cavity to facilitate breathing. External intercostal muscles aid in quiet and forced inhalation. 2  They originate on ribs 1-11 and have their insertion on ribs 2-12. 3  The external intercostals are responsible for the elevation of the ribs and bending them more open, thus expanding the transverse dimensions of the thoracic cavity.
the subcostals, made up of small slips of muscle near the angles of the lower ribs. The intercostal muscles in respiration: the primary role of the intercostal muscles is to stiffen the chest wall and to prevent the intercostal spaces from being sucked inwards when the diaphragm descends in inspiration.f the 12 pairs of ribs, pairs 1â7 are connected by their costal cartilages to the sternum (true ribs), the cartilages of ribs 8, 9 and 10 articulate with each other (false ribs), and pairs 11 and 12 are free anteriorly, capped by costal cartilage (floating ribs).