Super Hero Genetics 5y3m71
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Super Hero/ Evil Nemesis Lab: Investigating Inherited Traits
Introduction
Read the entire investigation before you begin. Heredity is the ing on of traits, or characteristics, from parent to offspring. The genetic makeup of an individual is known as its genotype. The physical traits you can observe in a person are his or her phenotype. Phenotype is a result of the genotype and the individual’s interaction with the environment. The units of heredity are called genes. Genes are found on the chromosomes in a cell. An allele is one of two or more forms of a gene. When the two alleles of a pair are the same, the genotype is homozygous, or pure. When the two alleles are not the same, the genotype is heterozygous, or hybrid. In nature, specific combinations of alleles happen only by chance. Some alleles are expressed only when the dominant allele is absent. These alleles produce recessive phenotypes. Alleles that are expressed when the genotype is either homozygous or heterozygous produce dominant phenotypes. An allele that codes for a dominant trait is represented by a capital letter, while an allele that codes for a recessive trait is represented by a lowercase letter. Sometimes when the genotype is heterozygous, neither the dominant nor recessive phenotype occurs. In this case, called incomplete dominance or codominance, an intermediate phenotype is produced. In humans, the sex of a person is determined by the combination of two sex chromosomes. People who have two X chromosomes (XX) are females, while those who have one X chromosome and one Y chromosome (XY) are males. In this investigation, you will see how different combinations of alleles produce different characteristics.
Problem How are traits inherited?
Pre-Lab Discussion. Work with your partner to answer the following questions 1. What does a single side of the coin represent?
2. What are the chances that any coin or disk tossed will land heads up?
3. How is a coin toss like the selection of a particular allele?
4. For the traits in this investigation, do all heterozygous pairs of alleles produce an intermediate phenotype?
5. Can you accurately determine a person’s genotype by observing his or her phenotype? Explain.
Materials (per pair) 2 coins Procedure 1. Obtain two coins. You and your partner will each flip a coin to determine the traits in a hypothetical offspring. 2. Start by determining the Nature of the offspring. Flip the coins. If both coins land the same side up, the offspring is a SUPER HERO. If the coins land different sides up, the offspring is an EVIL NEMESIS. Record the nature of the offspring in the blank on the worksheet. 3. For the rest of the coin tosses you will make, heads will represent the dominant allele and tails will represent the recessive allele. 4. You and your partner should now flip your coins into the well at the same time to determine the phenotype of the first trait, ability to fly. Note: The coins should be
flipped only once for each trait. After each flip, record the trait of your offspring on the appropriate line on the worksheet. 5. Continue to flip the coins for each trait listed in the table in Figure 1. 6. Using the recorded traits, draw your offspring on a separate piece of unlined paper. Use colored pencils Relatives might be heterozygous; one or more masked recessive genes could be ed to you.
Turn in the following: 1. The worksheet for your Super Hero/Evil nemesis 2. The drawing of the Super Hero/Evil nemesis 3. The answers to Pre-Lab Discussion, Analysis and Conclusion questions
Name ___________________________________________ Period __________ Partner’s name ______________________________________________
Data Table Trait
Super Hero/Evil nemesis Name: Dad’s
gene
Mom’s
gene
Offspring genotype
phenotype
Nature (Superhero/ Evil Nemesis) 1.
Ability to Fly
2. Super Strength 3. Super Speed 4. X-Ray Vision 5. Breathe
Underwater 6. Psychic Power 7. Super Stretching 8. Invisibility 9. Laser Blast Vision 10. Talk to animals 11. Martial Arts
Master 12. Wind / Storm Power 13. Spider Climbing 14. Shape-Changing 15. Sorcery & Magic
On a separate sheet of paper draw your Super Hero/Evil Nemesis
Analysis and Conclusions Answer the following questions on a separate piece of paper using complete sentences. 1.
What percent chance did you and your partner have of “producing” a Super Hero offspring? An Evil Nemesis offspring? Explain your answer.
2.
Would you expect the other pairs of students in your class to have an offspring completely similar to yours? Explain your answer.
3.
List all the traits in this investigation that showed incomplete dominance.
4.
Do you think that anyone in your class has all the same genetic traits that you have? Explain your answer.
6.
How might it be possible for you to show a trait when none of your relatives shows it?
Phenotypes Traits
Ability to Fly
Super Strength
Dominant (both heads)
Hybrid (one head, one tail)
Recessive (both tails)
Fly (FF)
Glide (not actually fly) (Ff)
Can’t Fly (ff)
Super Strength
Average Strength
No Super Strength
(SS)
Super Speed
(Ss)
(ss)
Super Speed
No Super Speed
(HH)
(hh)
Average Speed
(Hh)
X-Ray Vision
X-Ray Vision
(XX)
X-Ray Vision
(Xx)
Normal Vision
(xx)
Breathe Underwater Breathe Underwater
(BB)
Psychic Power
Psychic Power
(PP)
Breathe Underwater
(Bb)
Psychic Power
(Pp)
Cannot Breathe Underwater
(bb)
No Psychic Power
(pp)
Super Stretching Normal Flexibility Super Stretching
Super Stretching
(TT)
(Tt)
(tt)
Invisibility Invisibility
Invisibility
Laser Blast Vision
Laser Blast Vision
Communicates with animals
Communicates with Animals
(AA)
(Aa)
(II)
Laser Blast Vision
(LL)
Communicates with animals
Martial Arts Master
Martial Arts Master
(MM)
(Ii)
(Ll)
Average Green Belt
(Mm)
Not Invisible
(ii)
No Laser Blast Vision
(ll)
Does not Communicate with animals
(aa)
No Martial Arts Master
(mm)
Wind / Storm Power Wind / Storm Power
Wind / Storm Power
(WW)
(Ww)
No Wind / Storm Power
(ww)
Spider Climbing Spider Climbing
Spider Climbing
No Spider Climbing
(DD)
(Dd)
(dd)
Shape-Changing
Shape-Changing
No Shape-Changing
Sorcery & Magic
Sorcery & Magic
ShapeChanging
(ZZ)
(Zz)
(zz)
Sorcery & Magic
(GG)
(Gg)
No Sorcery & Magic
(gg)
Introduction
Read the entire investigation before you begin. Heredity is the ing on of traits, or characteristics, from parent to offspring. The genetic makeup of an individual is known as its genotype. The physical traits you can observe in a person are his or her phenotype. Phenotype is a result of the genotype and the individual’s interaction with the environment. The units of heredity are called genes. Genes are found on the chromosomes in a cell. An allele is one of two or more forms of a gene. When the two alleles of a pair are the same, the genotype is homozygous, or pure. When the two alleles are not the same, the genotype is heterozygous, or hybrid. In nature, specific combinations of alleles happen only by chance. Some alleles are expressed only when the dominant allele is absent. These alleles produce recessive phenotypes. Alleles that are expressed when the genotype is either homozygous or heterozygous produce dominant phenotypes. An allele that codes for a dominant trait is represented by a capital letter, while an allele that codes for a recessive trait is represented by a lowercase letter. Sometimes when the genotype is heterozygous, neither the dominant nor recessive phenotype occurs. In this case, called incomplete dominance or codominance, an intermediate phenotype is produced. In humans, the sex of a person is determined by the combination of two sex chromosomes. People who have two X chromosomes (XX) are females, while those who have one X chromosome and one Y chromosome (XY) are males. In this investigation, you will see how different combinations of alleles produce different characteristics.
Problem How are traits inherited?
Pre-Lab Discussion. Work with your partner to answer the following questions 1. What does a single side of the coin represent?
2. What are the chances that any coin or disk tossed will land heads up?
3. How is a coin toss like the selection of a particular allele?
4. For the traits in this investigation, do all heterozygous pairs of alleles produce an intermediate phenotype?
5. Can you accurately determine a person’s genotype by observing his or her phenotype? Explain.
Materials (per pair) 2 coins Procedure 1. Obtain two coins. You and your partner will each flip a coin to determine the traits in a hypothetical offspring. 2. Start by determining the Nature of the offspring. Flip the coins. If both coins land the same side up, the offspring is a SUPER HERO. If the coins land different sides up, the offspring is an EVIL NEMESIS. Record the nature of the offspring in the blank on the worksheet. 3. For the rest of the coin tosses you will make, heads will represent the dominant allele and tails will represent the recessive allele. 4. You and your partner should now flip your coins into the well at the same time to determine the phenotype of the first trait, ability to fly. Note: The coins should be
flipped only once for each trait. After each flip, record the trait of your offspring on the appropriate line on the worksheet. 5. Continue to flip the coins for each trait listed in the table in Figure 1. 6. Using the recorded traits, draw your offspring on a separate piece of unlined paper. Use colored pencils Relatives might be heterozygous; one or more masked recessive genes could be ed to you.
Turn in the following: 1. The worksheet for your Super Hero/Evil nemesis 2. The drawing of the Super Hero/Evil nemesis 3. The answers to Pre-Lab Discussion, Analysis and Conclusion questions
Name ___________________________________________ Period __________ Partner’s name ______________________________________________
Data Table Trait
Super Hero/Evil nemesis Name: Dad’s
gene
Mom’s
gene
Offspring genotype
phenotype
Nature (Superhero/ Evil Nemesis) 1.
Ability to Fly
2. Super Strength 3. Super Speed 4. X-Ray Vision 5. Breathe
Underwater 6. Psychic Power 7. Super Stretching 8. Invisibility 9. Laser Blast Vision 10. Talk to animals 11. Martial Arts
Master 12. Wind / Storm Power 13. Spider Climbing 14. Shape-Changing 15. Sorcery & Magic
On a separate sheet of paper draw your Super Hero/Evil Nemesis
Analysis and Conclusions Answer the following questions on a separate piece of paper using complete sentences. 1.
What percent chance did you and your partner have of “producing” a Super Hero offspring? An Evil Nemesis offspring? Explain your answer.
2.
Would you expect the other pairs of students in your class to have an offspring completely similar to yours? Explain your answer.
3.
List all the traits in this investigation that showed incomplete dominance.
4.
Do you think that anyone in your class has all the same genetic traits that you have? Explain your answer.
6.
How might it be possible for you to show a trait when none of your relatives shows it?
Phenotypes Traits
Ability to Fly
Super Strength
Dominant (both heads)
Hybrid (one head, one tail)
Recessive (both tails)
Fly (FF)
Glide (not actually fly) (Ff)
Can’t Fly (ff)
Super Strength
Average Strength
No Super Strength
(SS)
Super Speed
(Ss)
(ss)
Super Speed
No Super Speed
(HH)
(hh)
Average Speed
(Hh)
X-Ray Vision
X-Ray Vision
(XX)
X-Ray Vision
(Xx)
Normal Vision
(xx)
Breathe Underwater Breathe Underwater
(BB)
Psychic Power
Psychic Power
(PP)
Breathe Underwater
(Bb)
Psychic Power
(Pp)
Cannot Breathe Underwater
(bb)
No Psychic Power
(pp)
Super Stretching Normal Flexibility Super Stretching
Super Stretching
(TT)
(Tt)
(tt)
Invisibility Invisibility
Invisibility
Laser Blast Vision
Laser Blast Vision
Communicates with animals
Communicates with Animals
(AA)
(Aa)
(II)
Laser Blast Vision
(LL)
Communicates with animals
Martial Arts Master
Martial Arts Master
(MM)
(Ii)
(Ll)
Average Green Belt
(Mm)
Not Invisible
(ii)
No Laser Blast Vision
(ll)
Does not Communicate with animals
(aa)
No Martial Arts Master
(mm)
Wind / Storm Power Wind / Storm Power
Wind / Storm Power
(WW)
(Ww)
No Wind / Storm Power
(ww)
Spider Climbing Spider Climbing
Spider Climbing
No Spider Climbing
(DD)
(Dd)
(dd)
Shape-Changing
Shape-Changing
No Shape-Changing
Sorcery & Magic
Sorcery & Magic
ShapeChanging
(ZZ)
(Zz)
(zz)
Sorcery & Magic
(GG)
(Gg)
No Sorcery & Magic
(gg)
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