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• In the pea, tall plant height (T) is dominant
  over short (t). Pure-breeding tall and short
  plants are crossed
• What will be the genotype and phenotype of the
  F1?
• tall
• short
• intermediate

a. Is correct
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• In the pea, tall plant height (T) is dominant
  over short (t). Pure-breeding tall and short
  plants are crossed
• If the F1 is selfed and 400 F2 plats are raised,
• How many of the F2 plants would be expected to be
  pure breeding when selfed?
• 100
• 200
• 300
• 400

b. Is correct
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A B C D
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2
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4
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A cross is made between two individuals of
genotypes Aa BB Cc. A. How many genotypic
classes are expected? a. 3 b. 6 c. 9 d.
12
c. Is correct, 329
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• From the following cross
• Aa bb Cc x Aa bb Cc.
• What is a probability of obtaining an individual
  of genotype AA bb Cc?
• 1/4
• 1/2
• 1/8
• 1/16

c. Is correct, ¼ x ½1/8
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Application of binomial distribution and
factorials to genetics
P (n!/s!t!)psqt
n total number of events in the combination
(children) p probability of having one kind of
event (boy) qprobability of alternative event
(girl) snumber of one event (boys) tnumber of
alternative event (girls) (Remember 0! 1)
A couple desires to have 5 children What is
probability of having 4 boys and 1 girl?

prob (5!/4!1!)0.54x0.51 0.16
or
(p q)5 p5 5p4q 10p3q2 10p2q3 5pq4 q5
5p4q 0.16
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The average pea pod contains about 7 peas. If
heterozygous round pea plants are self
fertilized, what proportion of the pods will have
5 round and 2 wrinkled peas?
P (n!/s!t!)psqt
What are the values have p and q ?

• p1/4, q1/2
• p3/4, q1/2
• p1/2, q1/2
• p3/4, q1/4

d. Is correct
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The average pea pod contains about 7 peas. If
heterozygous round pea plants are self
fertilized, what proportion of the pods will have
5 round and 2 wrinkled peas?
P (n!/s!t!)psqt
Now enter the values for s and t and solve
Answer a. 7!/2!5!(3/4)2(1/2)5 b.
7!/5!2!(3/4)5(1/4)2 c. 7!/5!2!(3/4)5(1/2)2 d.
7!/2!5!(3/4)2(1/4)5
b. Is correct