Answer:A. The release of calcium ions causes myosin and actin to attach to each other.
The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.
Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.
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The probability that their son exhibits the 'color blind' trait is 0%. It is a type of inheritance linked to the X chromosome.
<h3>Inheritance linked to the X chromosome</h3>
In men, the patterns of inheritance linked to the X chromosome don't follow conventional mendelian inheritance because men have only one X chromosome.
Conversely, women have two X chromosomes, thereby the inheritance pattern resembles Mendelian inheritance.
It is important to highlight that color blindness is a recessive trait on the X chromosome.
In this case, the mother is a carrier, thereby the probability of passing this trait as a carrier to her son is 50%, whereas the father is normal, thereby the probability of passing this trait to his son is 0%.
Learn more about inheritance linked to the X chromosome here:
brainly.com/question/1020249
50% of the offspring will be Aa (red), 50% will be aa (white).
In frogs, different mating seasons are a barrier to reproduction.
