Question

In this activity, you will compare the expected results of a monohybrid cross obtained by completing a Punnett square to the actual results of a monohybrid cross represented by tossing two coins. One coin represents the two possible female gametes and the second coin represents the two possible male gametes. A toss of the coins models fertilization. Complete the following Punnett square for a monohybrid cross between two heterozygous parents represented by two coins. The genotype for each parental coin is Hh where H represents heads and h represents tails. The Punnett square will determine the probability that each genotype combination will be passed to four offspring. H H h h What is the expected genotypic ratio of the offspring from the Punnett square? What is the expected phenotypic ratio of the offspring from the Punnett square? Now use two coins to see if your expected results from the Punnett square match your actual results. One of the coins represents female gametes while the other represents male gametes. Toss the coins a total of 20 times to mimic 20 fertilization events. Record your results in Data Table 10.3. Data Table 10.3 Coin Toss Results Toss Genotype HH Genotype Hh Genotype hh 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Total Numbers Genotype Ratio (Total/20) : 20 : 20 __ 20

          In this activity, you will compare the expected results of a monohybrid cross obtained by completing a Punnett square to the actual results of a monohybrid cross represented by tossing two coins. One coin represents the two possible female gametes and the second coin represents the two possible male gametes. A toss of the coins models fertilization.

Complete the following Punnett square for a monohybrid cross between two heterozygous parents represented by two coins. The genotype for each parental coin is Hh where H represents heads and h represents tails. The Punnett square will determine the probability that each genotype combination will be passed to four offspring.

H   H
h   h

What is the expected genotypic ratio of the offspring from the Punnett square?
What is the expected phenotypic ratio of the offspring from the Punnett square?

Now use two coins to see if your expected results from the Punnett square match your actual results. One of the coins represents female gametes while the other represents male gametes. Toss the coins a total of 20 times to mimic 20 fertilization events. Record your results in Data Table 10.3.

Data Table 10.3 Coin Toss Results
Toss   Genotype HH   Genotype Hh   Genotype hh
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Total Numbers
Genotype Ratio (Total/20)
__________    :
20
__________    :
20
__________    
20

Added by Sara F.

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