Probability practice problems
1. If a coin is flipped five times in a row, the probability of getting five
heads is?
2. Being weird is dominant to being normal. A heterozygous weird male
and a normal female have a child. What is the probability that they will
have weird children?
3. If the couple in question 2 has four children, what is the probability that
all of them will be normal? Weird?
4. If you cross two parents who are heterozygous for a particular trait, what
is the probability that they will have kids who are homozygous recessive
for that trait?
5. If the parents in question 4 have three children total, what is the
probability that all three of them will be homozygous recessive for that
trait?
6. Mom is homozygous dominant and Dad is homozygous recessive for a
particular trait. If one of their kids marries an individual who is
heterozygous for that same trait, what are the odds that the resulting
grandchildren will be homozygous recessive?
7. Both Mom and Dad are heterozygous for a particular trait. What are the
odds that they will have children who are also heterozygous? If one of
those heterozygous children married someone who is also heterozygous,
what are the odds of the grandchildren being heterozygous?
8. Suppose you flipped a coin ten times, and each time it came up heads.
What are the chances of getting heads again on the next flip?
9. Being a hero is dominant to being a spineless coward. If a female hero
and a male spineless coward have 4 children, what are the odds that all of
the children will be spineless cowards? (Assume mom is heterozygous)
10. Slimy skin is dominant to dry skin. Suppose a slimy-skinned frog mates
with another slimy-skinned frog. Both are heterozygous. What are the odds
of having a dry-skinned baby? What are the odds that all 100 of their
offspring will be dry-skinned?