For this problem, you may want to create a Punnett Square on a separate piece of paper. Manuel has both cystic

fibrosis, a recessive disorder, and sickle cell anemia which is also a recessive disorder. Manuel’s partner, Lucretia, is
normal for both conditions. What is the probability that Manuel and Lucretia will have a normal child without either of the
conditions Manuel has?



a. 0%
b. 25%
c. 75%
d. 100%
e. It is not possible to solve this problem with the information provided.


ANSWER: e

Biology & Microbiology

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The common ancestor of all animals is likely to have been a ________.

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