Lab 12: Probability and Mendelian Genetics

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Name _______________
Name _______________
Club
Black Card
Period _______________
#7
Black 7
Expected
Tails
Observed
7 of Clubs
Expected
Outcome
# of tosses
Expected
Heads
Observed
Difference
% deviation
Difference
10
50
class
1. What is the relationship between sample size and the degree of error for a chance occurrence?
2. What is the value of class data in a genetics experiment?
Tosses
Individual
Class
Observed Expected Observed Expected
Head/Head
Head/Tail
Tail/Tail
Total Tosses
3. For the class results, what approximate fraction of the tosses turned out both heads? Both tails? One
head and one tail?
4. If the chance of flipping one head with a coin is 50% (1/2), then the probability of flipping two heads
at once is computed by doing what to their separate probabilities?
5. Which comes closer to the expected, the class, or the individual results?
6. If the chance of flipping a head or a tail on a coin is 1/2, why did approximately 1/2, rather than 1/4, of
the tosses result in a heads-tail combination?
½H
½T
½A
½H
½A
½T
½a
½a
7. Referring to the results of your Punnett square, what fraction of the offspring should receive the alleles
“aa?” If there is only one offspring, what are is its chances of receiving the alleles “Aa?”
Soybean Flower Color
P1 cross = PP x pp
F1 cross = Pp x Pp
8. In the P1 cross, what is the genotype of all the offspring? What is the phenotype?
9. In the F1 cross, what is the genotypic ratio (the number of each kind of genetic pairing)?
What is the phenotypic ratio (the number of each kind of effect or appearance)?
10. In a monohybrid cross involving dominance, two red flowers (Rr) are crossed producing 160
offspring – 115 red (RR or Rr) and 45 white (rr). Prepare a Punnett square and determine the expected
results. Then calculate the percent deviation.
%dev =’s __________
Dihybrid Cross Punnet Square
Gametes (top & side row
– possible offspring clear
center cells
Genotype
BBRR
BBRr
BBrr
BbRR
BbRr
Bbrr
bbRR
bbRr
bbrr
Genotypic Frequency
Phenotype
Phenotypic Frequency
×

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