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Exercise 8, Human Genetics
Activity 1, Understanding genetics through chromosome
analysis, #1-4
1. Figure 8-1 shows an example of a female karyotype.
Are there 46 total chromosomes? _____
How many pairs of autosomes are in the karyotype? _____
How many pairs of sex chromosomes? _____
2. Examine the homologous pair of sex chromosomes (Figure 8-
1). Is there a visible difference between the maternal and
paternal chromosomes? ______. Explain.
3. Figure 8-2 shows an example of a male karyotype.
Are there 46 total chromosomes? _____
How many pairs of autosomes are in the karyotype? _____
How many pairs of sex chromosomes? _____
4. Is there a visible difference between the X and Y
chromosomes? _____ Explain.
Activity 2, Abnormal karyotypes, #1 and 3
1. In your report, include the following information:
Gender of patient: _________________
Description of any chromosomal abnormalities present in the
karyotype: __________________
Name of abnormality (if present): ___________________
3. Would it be possible for the person who provided the
karyotype in figure 8-5 to have a daughter with Down Syndrome
if he or she had a spouse with a normal karyotype? Explain.
Activity 3, Relationship of chromosomes, genes, and alleles,
#1-5
1. Which of the above genotypes represents an individual who is
homozygous for the melanin trait? ______
2. Which of the genotypes listed in question one contains one
maternal allele and one paternal allele? Explain.
3. Which genotype(s) listed in question one represent(s) an
individual that is heterozygous? _____
4. Would there be a phenotypic difference between AA and Aa
when the genes are expressed? Explain.
5. Which genotype listed in question one represents a person
who is an albino? Explain.
Activity 4, Determining inheritance by combining alleles, #1-7
1. Based on your knowledge of dominant and recessive alleles,
fill in the phenotypes for each allele combination.
Genotypes
Phenotypes
AA
Aa
aa
2. Combine the appropriate alleles to complete the other three
boxes in the Punnett Square.
A
a
A
AA
a
What is the probability that this couple could have an albino
child?
3. If this couple does have an albino child, what is the
probability they could have a second albino child? Explain.
4. If this couple has a child with normal skin color, is there any
possibility that this normal child could have an albino baby?
Explain.
5. Is he correct in his assumption? Explain.
6. What are the genotypes of all the individuals mentioned in
the problem?
Genotypes: Steve _____ Steve’s Mom _____ Steve’s Dad
_____ Marilyn _____
7. What is the probability that Steve and Marilyn could have an
albino child?
Probability of an albino child: _____
Probability of a child with normal skin color: _____
Exercise 9, Molecular Genetics
Activity 1, Building a DNA model, #1-8
1. Table 9-1, DNA Color Codes
Gummy Bear Color
DNA base
5. Your DNA model contains a total of _____ bases.
6. How many triplets are present along the left side of the DNA
molecule you made? ______
7. What is the last triplet on the right side of the DNA model?
_____
8. If you were comparing your DNA to a classmate’s DNA,
would you use the same bases to construct the DNA molecule?
Explain.
Activity 2, Transcription, #1-5
1. Complete Table 9-2 by entering the appropriate bases.
DNA base
mRNA base
A
C
T
G
2. Looking at Figure 9-2 (next page), you can see that column
one contains the DNA sequence found along one side of a
double helix. Fill in the appropriate mRNA sequence in the
second column.
Figure 9-2
1
2
3
DNA
mRNA
Amino Acids
A
T
G
T
A
T
G
T
T
T
T
G
A
C
G
G
G
A
G
A
C
C
C
C
3. The mRNA code is composed of a sequence of three bases
along the mRNA molecule. The three bases are referred to as a
codon.
ATG is the first triplet on the DNA sequence. What is the
corresponding codon? _____
4. How many codons does your mRNA strand contain? _____
5. What is the base sequence of the fourth codon of your
mRNA? _____
Activity 3, Translation and protein synthesis, #1-5
1. Fill in column three of Figure 9-2 with the correct amino
acids.
2. How many amino acids does your protein contain? _____
3. What is the sixth amino acid in the polypeptide chain? _____
4. If the sixth triplet read GAA instead of GGA, would the
sequence of amino acids change? Explain.
5. If the sixth triplet read GGC instead of GGA, would the
sequence of amino acids change? Explain.

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  • 1. Exercise 8, Human Genetics Activity 1, Understanding genetics through chromosome analysis, #1-4 1. Figure 8-1 shows an example of a female karyotype. Are there 46 total chromosomes? _____ How many pairs of autosomes are in the karyotype? _____ How many pairs of sex chromosomes? _____ 2. Examine the homologous pair of sex chromosomes (Figure 8- 1). Is there a visible difference between the maternal and paternal chromosomes? ______. Explain. 3. Figure 8-2 shows an example of a male karyotype. Are there 46 total chromosomes? _____ How many pairs of autosomes are in the karyotype? _____ How many pairs of sex chromosomes? _____ 4. Is there a visible difference between the X and Y chromosomes? _____ Explain. Activity 2, Abnormal karyotypes, #1 and 3 1. In your report, include the following information: Gender of patient: _________________ Description of any chromosomal abnormalities present in the karyotype: __________________ Name of abnormality (if present): ___________________ 3. Would it be possible for the person who provided the karyotype in figure 8-5 to have a daughter with Down Syndrome if he or she had a spouse with a normal karyotype? Explain.
  • 2. Activity 3, Relationship of chromosomes, genes, and alleles, #1-5 1. Which of the above genotypes represents an individual who is homozygous for the melanin trait? ______ 2. Which of the genotypes listed in question one contains one maternal allele and one paternal allele? Explain. 3. Which genotype(s) listed in question one represent(s) an individual that is heterozygous? _____ 4. Would there be a phenotypic difference between AA and Aa when the genes are expressed? Explain. 5. Which genotype listed in question one represents a person who is an albino? Explain. Activity 4, Determining inheritance by combining alleles, #1-7 1. Based on your knowledge of dominant and recessive alleles, fill in the phenotypes for each allele combination. Genotypes Phenotypes AA Aa aa 2. Combine the appropriate alleles to complete the other three boxes in the Punnett Square.
  • 3. A a A AA a What is the probability that this couple could have an albino child? 3. If this couple does have an albino child, what is the probability they could have a second albino child? Explain. 4. If this couple has a child with normal skin color, is there any possibility that this normal child could have an albino baby? Explain. 5. Is he correct in his assumption? Explain. 6. What are the genotypes of all the individuals mentioned in the problem? Genotypes: Steve _____ Steve’s Mom _____ Steve’s Dad _____ Marilyn _____ 7. What is the probability that Steve and Marilyn could have an albino child?
  • 4. Probability of an albino child: _____ Probability of a child with normal skin color: _____ Exercise 9, Molecular Genetics Activity 1, Building a DNA model, #1-8 1. Table 9-1, DNA Color Codes Gummy Bear Color DNA base 5. Your DNA model contains a total of _____ bases. 6. How many triplets are present along the left side of the DNA molecule you made? ______
  • 5. 7. What is the last triplet on the right side of the DNA model? _____ 8. If you were comparing your DNA to a classmate’s DNA, would you use the same bases to construct the DNA molecule? Explain. Activity 2, Transcription, #1-5 1. Complete Table 9-2 by entering the appropriate bases. DNA base mRNA base A C T G 2. Looking at Figure 9-2 (next page), you can see that column one contains the DNA sequence found along one side of a double helix. Fill in the appropriate mRNA sequence in the second column.
  • 8. C C C 3. The mRNA code is composed of a sequence of three bases along the mRNA molecule. The three bases are referred to as a codon. ATG is the first triplet on the DNA sequence. What is the corresponding codon? _____ 4. How many codons does your mRNA strand contain? _____ 5. What is the base sequence of the fourth codon of your mRNA? _____ Activity 3, Translation and protein synthesis, #1-5 1. Fill in column three of Figure 9-2 with the correct amino acids. 2. How many amino acids does your protein contain? _____ 3. What is the sixth amino acid in the polypeptide chain? _____ 4. If the sixth triplet read GAA instead of GGA, would the sequence of amino acids change? Explain. 5. If the sixth triplet read GGC instead of GGA, would the
  • 9. sequence of amino acids change? Explain.