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Rule of multiplication (Product Law)
is that the probability that independent
events will occur simultaneously is the product of their individual probabilities.
Question1:
In a Mendelian cross between pea plants that are heterozygous for flower
color (
Pp
), what is the probability that the offspring will be homozygous
recessive?
Answer:
Probability that an egg from the F
1
(
Pp
) will receive a
p
allele = 1/2.
Probability that a sperm from the F
1
will receive a
p
allele = 1/2.
The overall probability that two recessive alleles will unite, one from the egg
and
one from the sperm, simultaneously, at fertilization is: 1/2 X 1/2 = 1/4.
Question 2:
Probability of rolling a 2 and then a 4 with a dice
P(2 and 4) = 1/6 x 1/6 = 1/36
Question 3:
If both parents are Bb what is the probability of the offspring being bb?
Answer:
The offspring must receive a b gamete from both parents.
The probability of a b sperm is 1/2
The probability of a b ovum is also 1/2
Thus the probability of a bb offspring is the product of the two
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 Spring '08
 SAXENA
 Plants

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