I'm not sure how exactly you wanted this question to be answered. You're either talking about the symmetry where animals would have two legs or two arms for example and thus producing a pair of each muscle on both sides of the body, or you're refering to the development of agonistic and antaonistic muscles where each of them served a different purpose; either extending or contracting.
According to Mendel’s laws of dominance, when a plant with dominant trait is crossed with plant with recessive trait, it results into dominant phenotype in F1 offspring. In the given question, a plant with pointed leaves (P) are dominant and plant with round leaves (p) is recessive. On crossing a pointed leaves (PP) with a plant with round leaves (pp) a heterozygous (Pp) pant with pointed leaves will be produced.
The magnetic force decreases.
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Contractile proteins<span> generate force for muscle contraction. The two </span>contractile proteins<span> in myofibrils are actin (part of the thin filament) and myosin (part of the thick filament)</span>
