Case 3_Assessment 1. What is the name of the process of cell division that creates egg and sperm cells? ___________________________________ 2. This is a drake cell that will divide to become egg cells. How many egg cells will this one cell make? __________ How many chromosomes will be in each of the egg cells? __________ 3. Human cells have 46 chromosomes. How many chromosomes would each egg cell or sperm cell have? __________ ©The Concord Consortium Geniverse Project
Case 3_Assessment 4. Below are two parent drakes. You can see which version of each trait they have and you can see their labeled chromosomes in a cell before meiosis. Mother Father Offspring (Not an egg cell) (Not a sperm cell) Draw and label the egg cell from the mother and the sperm cell from the father that would undergo fertilization to produce the offspring shown above. ©The Concord Consortium Geniverse Project
Case 3: Student Organizer Use this sheet to record your work and findings from Case #3.
Challenge 1: In the Clutches of Drakes
To advance in the Guild, you must be able to produce baby drakes with certain traits. Drakes give birth to 20 offspring at a time. Each batch of baby drakelings is called a clutch. Match the target
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The father drake has been selected for you and his alleles are not changeable. Set the mother’s alleles so that when bred with the father you could get a drakeling like the target. Click the breed button to produce a clutch of drakelings. Drag a baby from the clutch onto the target drakeling to see if it is a match. •
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Clicking the Breed button does not count as a move. Dragging an offspring to a target does count as a move. •
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Tips for Trainees
1. Use this space to describe how well you did, what worked and what didn’t work. This is the target: Write in the father’s given alleles below: ©The Concord Consortium Geniverse Project
Case 3: Student Organizer Challenge 2: Still in the Clutches
This time the mother has been selected for you and her alleles cannot be changed. You must set the father’s alleles so that at least one of their clutches will contain both target drakelings at the same time. Tips for Trainees
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Observe the target drakelings’ traits. Look at the mom’s alleles. Set the dad’s alleles so that his sperm cells will help make both target drakelings. 1. Use this space to describe how well you did, what worked and what didn’t work. These are the targets: Write in the mother’s given alleles below: ©The Concord Consortium Geniverse Project
Case 3_Think-­‐Write-­‐Pair-­‐Share Take 3 minutes to silently answer these questions.
1. Why is there more than one way to produce the target offspring? 2. What is the role of meiosis in producing the target offspring from the two parents in the second challenge of Case 3? Use pictures if it will help you explain. ©The Concord Consortium Geniverse Project