Download 6 Day 20 Probability Problems

Unit 6 Day 20
Probability Problems
Directions: Answer all the questions for the following questions using the Rule of Multiplication. You MUST
show ALL your work.
These are simple. Just follow the example, in the problem that is worked out for you. In performing these
questions, remember that each lettered trait is a single monohybrid Punnett square (4 possible squares). You
are counting the number of squares where the DESIRED trait occurs. In doing these problems, you CAN ONLY
have three possible outcomes: 1/4 = one square possess the DESIRED trait; 2/4= 1/2 = two squares posses the
DESIRED trait; 4/4 = 1 = ALL four squares possess the DESIRED trait. Once you have done all letters, just multiple
the fractions to get to the Probability of getting that SPECIFIC DESIRED genetic outcome.
EXAMPLE: What is the probability that the following parents will produce the indicated (DESIRED) offspring?
Assume Independent Assortment of all gene pairs.
Parents Genotypes: Male: AABb CC X Mother: Aa Bb cc
Offspring (Desired) Genotype: AABbCc
To Solve: Put one parent under the other. Then Put the Desired Offspring under them like below. Draw arrows
for each POSSIBLE gene combination that will yield the DESIRED genotype. Then count the number of arrows.
Each arrow represents a box in the Punnett square. REMEMBER, there are only three possible fractions we can
get. See above. Once you have the fractions for each letter, multiple them together to get the probability or
likelihood of getting that DESIRED offspring genotype from that parent cross.
l
l
MALE:
A A l B b l C C
↓↙ l
X l ↓X↓
FEMALE:
A a l B b l c c
l
l
OFFSPRING: A A l B b l C c
(DESIRED)
l
l
# of Arrows:
2
l
2
l
4
l
l
1
1
Fraction:
/2 x
/2 x
1 = 1/4 Probability OR 25% Chance for that DESIRED
genotype outcome
Unit 6 Day 20
1)Parents: Male – AABBCC
Female – aabbcc
DESIRED Offspring – AaBbCc
Female – AaBbCc
DESIRED Offspring – AabbCC
SHOW ALL YOUR WORK
2) Parents: Male – AABbCc
SHOW ALL YOUR WORK
3) Parents: Female - AaBbCc
SHOW ALL YOUR WORK
Male – AaBbCc
DESIRED Offspring – AaBbCc
Unit 6 Day 20
4) Parents:
Female – AabbCc
Male – aaBBcc
DESIRED Offspring – AaBbcc
SHOW YOUR WORK
5) Parents: Male – aabbcc
Female – AaBbCc
DESIRED Offspring – aaBbcc
SHOW YOUR WORK
For the next 5 problems the parents are the following: Male – AaBbCcDd
6) DESIRED Offspring – aabbccdd
SHOW YOUR WORK
Female – AaBbCcDd
Unit 6 Day 20
7) DESIRED Offspring – AaBbCcDd
SHOW YOUR WORK
8) DESIRED Offspring – AABBCCDd
SHOW YOUR WORK
9) DESIRED Offspring – AabbCcDD
SHOW YOUR WORK
Unit 6 Day 20
10) DESIRED Offspring – AaBBCCDd
SHOW YOUR WORK