If you are talking about coins, 25%
If you are talking about genetics, then it is less than 1%.
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The opposite of getting at most two heads is getting three heads. The probability of getting three heads is (1/2)^2, which is 1/8. The probability of getting at most two heads is then 1 - 1/8 which is 7/8.
The conditional probability is 1/4.
1/4
There are two sides to the coin, so the probability of getting heads or tails on one flip of the coin is 1/2 or 50%.
In two tosses: 1/4.