Schwartz Science
Open the websites for each section: Hold CTRL then click on the site. Answer questions by clicking on the grey box.
Part II: Probability of Inheritance
1. EXAMPLE: Here is a Punnett Square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant with yellow pods crossed with a plant that is heterozygous for pod color. (Green pod color is dominant. Use G, g)
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*Complete the following Punnett Squares as well as the Genotype ratios and Phenotype ratios.
2. Create a Punnett Square to determine percent probabilities of genotypes and phenotypes of the offspring of two pea plants that both are homozygous for yellow seed color. (Yellow color is dominant over green. Use Y, y)
3. Create a Punnett Square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant that is homozygous for yellow seed color with a plant with green seeds. (Yellow color is dominant over green. Use Y, y)
| |g |g |
|G |Gg |Gg |
|g |gg |gg |
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4. Create a Punnett Square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant that is homozygous for green pod color with a plant that is heterozygous for pod color. (Green pod color is dominant over yellow. Use G, g)
5. Create a Punnett Square to determine percent probabilities of genotypes and phenotypes of the offspring of two pea plants that are both heterozygous for seed shape. (Round shape is dominant over wrinkled. Use R, r)
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6. If a carrier (Aa) for a recessive disease mates with someone who has it (aa), the likelihood of their children also inheriting the condition is far greater. On average, % of the children will be heterozygous (Aa) and, therefore, carriers. The remaining % will inherit two recessive alleles (aa) and develop the disease.
Part I: What is Heredity?
Click on the “What is Heredity?” tour of the basics and answer the following questions.
1. The passing of from parent to child is the basis of heredity.
2. Where are the instructions that define our traits?
3. What is an allele, and how many do we have for each trait?
4. What do homozygous and heterozygous mean?
Homozygous:
Heterozygous:
5. If someone has a dominant allele and a recessive allele, what will happen?
Scroll back up to the top to complete Part II.
Part III: Dichotomous Keys
Click on “What is a Key?” to answer:
1. Why would you use a dichotomous key?
2. What does dichotomous mean?
3. How does a dichotomous key work?
Click on “How to Make a Key” to answer:
4. What is the first step in making a dichotomous key?
5. What is the second step?
6. How many choices should one have at each step decision point of the key?
After viewing the sample dichotomous key, click on the Interactive Key and complete the activity. Fill in the names for each insect.
Insect #1: Insect#3:
Insect # 2: Insect #4:
Part IV: Identifying Fish
Use the key to identify the nine fish. Type the name of each fish in the box that corresponds with the fish on the website.
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Assessment Questions (5): Bold or highlight the correct of Form
1. Butterflies usually are identified by the colors and patterns on their wings. Butterflies have four wings: The two wings near the butterfly’s head are “forewings” while the wings near the butterfly’s tail are “hindwings.” You can use the following dichotomous key to identify four common butterfly species in North America.
Based on the key, what species of butterfly is shown below?
MACROBUTTON HTMLDirect [pic] A. Papilio glaucus
MACROBUTTON HTMLDirect [pic] B. Papilio polyxenes
MACROBUTTON HTMLDirect [pic] C. Danaus plexippus
MACROBUTTON HTMLDirect [pic] D. Colias philodice
2. Based on the same dichotomous key, what is the butterfly shown below?
MACROBUTTON HTMLDirect [pic] A. Papilio glaucus
MACROBUTTON HTMLDirect [pic] MACROBUTTON HTMLDirect [pic]B. Papilio polyxenes
MACROBUTTON HTMLDirect [pic] MACROBUTTON HTMLDirect [pic]C. Danaus plexippus
MACROBUTTON HTMLDirect [pic] D. Colias philodice
3. Which species is this butterfly?
MACROBUTTON HTMLDirect [pic] A. Papilio glaucus
MACROBUTTON HTMLDirect [pic]MACROBUTTON HTMLDirect [pic]B. Papilio polyxenes
MACROBUTTON HTMLDirect [pic]MACROBUTTON HTMLDirect [pic]C. Danaus plexippus
MACROBUTTON HTMLDirect [pic]D. Colias philodice
4. A student creates a dichotomous key to identify common household pets. What is wrong with this key?
MACROBUTTON HTMLDirect [pic]A. Hamsters have hairy bodies.
MACROBUTTON HTMLDirect [pic]B. Goldfish don't live in cages.
MACROBUTTON HTMLDirect [pic]C. A pet can have a hairy body and live in a cage, or can be hairless and not live in a cage.
MACROBUTTON HTMLDirect [pic] D. All of the above.
5. Suppose you were making a dichotomous key to identify the three types of leaves shown below. Which of the following traits could you use to classify these leaves into separate groups?
MACROBUTTON HTMLDirect [pic] A. Presence or absence of veins in the leaves.
MACROBUTTON HTMLDirect [pic] B. Presence or absence of stems.
MACROBUTTON HTMLDirect [pic] C. How leaves are arranged on branches.
MACROBUTTON HTMLDirect [pic] D. Size of leaves.
Extra Credit: Website
Choose a key from- California albatrosses, Canadian Rockies buttercups, Texas venomous snakes, Virginia evergreens, and Florida cartilaginous fishes-and fill it in below. Identify organisms A-G and record your answers in the table.
Key:
|Organism |Common name |Scientific name |
|A | | |
|B | | |
|C | | |
|D | | |
|E | | |
|F | | |
|G | | |
Bottom of Form
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Phenotype ratios
Genotype ratios
Gg 50%
gg 50%
Phenotype ratios
Green Pods 50%
Yellow Pods 50%
Genotype ratios
Phenotype ratios
Yellow Pods :
Green Pods :
Genotype ratios
Genotype ratios
Phenotype ratios
Genotype ratios
Phenotype ratios
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