Answer:
There is no chance that a child of one parent who carries CF gene is born having Cystic Fibrosis if the other parent does not carry the CF gene.
Explanation:
Second child born to Chloe’s mother and stepfather will have Cystic Fibrosis only if they inherit one CF gene from each parent. Since stepfather is not carrier of CF gene, development of the disease at child is not possible.
A person who has inherited one CF gene from his/her parent will be a CF gene carrier, but will never develop Cystic Fibrosis. However as he/she a carrier of the CF gene, they can pass it on to their own child.
Answer:
B. PEi + KEi = PEf + KEf
Explanation:
It is given that
A leaf falling to the ground before hitting the ground has an initial total energy of PEi + KEi.
And the total final energy of the leaf after it hits the ground is PEf + KEf .
Since there is no air resistance, therefore the total energy is conserved.
According to the conservation of law of conservation of energy, energy is neither created nor it is destroyed. The energy is always conserved. The initial energy will be equal to the final energy.
Thus the total energy of the leaf before hitting the ground and after hitting the ground will be equal.
Thus initial energy is equal to the final energy.
Hence the answer is ---
B. PEi + KEi = PEf + KEf
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