Find the binomial distribution and its normal approximation for the number of tall offspring. What is the

Question:

Find the binomial and its normal approximation for the number of tall offspring. What is the probability of getting ten or fewer?
Suppose that the alleles A and a for height are additive, meaning that plants with genotype AA are tall, plants with genotype Aa are intermediate, and those with genotype aa are short. If an Aa plant is crossed with another Aa plant, 1/4 of the offspring should be tall, 1/2 should be intermediate, and 1/4 should be short. Assuming that the other conditions for the binomial are met, find the probabilities of the following. Suppose such a cross produces 36 offspring.
Distribution
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