Student exploration cladograms answer key

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Student exploration cladograms answer key

During sexual reproduction, two sex cells fuse to create a fertilized cell with a complete set of chromosomes. What must be true about the number of chromosomes in each sex cell? What happens to the cell at the beginning of interphase? Describe what happens. In the Gizmo, drag the homologous chromosomes together. Click the centrosome to pull the chromosomes apart. Compare : An image of the anaphase step in mitosis is shown to the right. How does anaphase I in meiosis differ from anaphase in mitosis?

At the end of anaphase I meiosishow many chromosomes are on each side?

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Describe what happens when you click on the chromosomes during telophase I. Observe : Go through the steps of the second half of meiosis until you reach the end of telophase II, following the instructions at the top right corner. As you proceed, answer the questions below. During metaphase II, do homologous chromosomes pair up as in metaphase I? How does anaphase II differ from anaphase I? At the end of anaphase II, how many chromatids are on each side of the cell?

After cytokinesis, how many cells have been formed from the parent cell? Each daughter cell contains one chromatid from each homologous pair.

Observe : Click on the spermatids. Sketch a mature sperm cell in the space to the right. Sperm are designed for one purpose, to deliver genetic material to the egg cell during fertilization.

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A male gamete delivers genetic material to a female gamete. Question: What are the differences in meiosis between male and female cells?

For the female cell, proceed through meiosis until you reach the end of anaphase I. Up to this point, did you notice any differences between the development of male and female gametes? Compare : Proceed through telophase I and cytokinesis I. How does this compare to the two cells at the end of telophase I and cytokinesis I in male cells? What is the largest cell called?See All. See All Free Gizmos. Based on the similarities and differences between different organisms, create branching diagrams called cladograms to show how they are related.

Use both morphological data physical traits and molecular data to create the simplest and most likely cladograms. Five different sets of organisms are available. A visitor has shared a Gizmo from ExploreLearning.

You get Free Gizmos to teach with. See the full list. Access lesson materials for Free Gizmos. Free Gizmos. Login Help? Student Class Enrollment. Enroll in Class.

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Sign Up Free. Launch Gizmo. Cladograms Based on the similarities and differences between different organisms, create branching diagrams called cladograms to show how they are related. MS Word version.

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Vocabulary Sheet. Subscribing teachers can download lesson materials contributed by other teachers, as well as contribute their own lesson materials for Gizmos.

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For information on how to subscribe, please contact us. If you are a current subscriber, please login.June 04, In the winter, people often buy large bags of rock salt to sprinkle on their walkways.

student exploration cladograms answer key

Why do people do this? How do you think adding salt to water affects its freezing point? Gizmo Warm-up. People often use salt to alter the freezing point of water. What is happening? Describe the motion of molecules in a solid. Activity A:. Freezing point depression. Get the Gizmo ready :. Question: How does salt affect the freezing point of water and the melting point of ice? Observe : With the room temperature at 5.

Look at the thermometer inside the container of water. What is the freezing point of pure water. What do you notice about the water temperature as the water is freezing?

What happens to the ice temperature after all the water is frozen? Predict : How do you think adding salt will affect the freezing and melting points of water? What is the freezing point of this salt solution? Observe : Look for the salt particles in the ice. What do you notice? Activity A continued on next page Activity A continued from previous page.

Observe the water temperature as the ice melts. What is the melting point of this salt solution? Collect data : Use the data you have collected so far to fill in the first two rows of the table below. Then, find the freezing and melting points of water with grams of salt.

Amount of salt g. Summarize : How does increasing the concentration of salt affect the freezing and melting points of water?

Analyze : How much is the freezing point lowered by adding 50 g of salt? Test : Based on your data, what do you expect the freezing and melting points to be when grams of salt are added? How about with grams of salt?

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Write your predictions in the appropriate columns below. Amount of salt. Freezing Point predicted. Freezing Point actual. Melting point predicted. Melting Point actual. After writing your predictions, use the Gizmo to find the actual values.

Fill in as much of the table as you can. Think and discuss : Why do people add salt to roads and walkways in the winter?Original Document: Cladogram Analysis. What is a cladogram? It is a diagram that depicts evolutionary relationships among groups.

Sometimes a cladogram is called a phylogenetic tree though technically, there are minor differences between the two. In the past, biologists would group organisms based solely on their physical appearance.

Think about what the word "innovation" means in regular language. Examine the sample cladogram, each letter on the diagram points to a derived character, or something different or newer than what was seen in previous groups.

Match the letter to its character.

New science Gizmo development in 2018—and beyond

Note: this cladogram was created for simplicity and understanding, it does not represent the established phylogeny for insects and their relatives.

To make a cladogram, you must first look at the animals you are studying and establish characteristics that they share and ones that are unique to each group. For the animals on the table, indicate whether the characteristic is present or not. Based on that chart, create a cladogram like the one pictured above. Publisher: Biologycorner.Vocabulary : distance, speed.

The speed of an animal is how fast it is moving.

student exploration cladograms answer key

You have been sent on an African safari by International Geography magazine. Your assignment is to find the fastest land animals in the world. Your only tool is a video camera. Press the record button. Press stop when the animal has passed by. Click Advance frame to move forward exactly one second at a time.

Click Tools at upper left, and drag some arrows onto the recording to mark the positions of the animals at different times.

student exploration cladograms answer key

Get the Gizmo ready :. Run Gizmo : Record an animal running.

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Which animal did you record? Measure : Click Rewind. Use Advance frame to advance the recording one second. Estimate the distance the animal traveled in one second.

Note: The trees in the background are 5 meters apart.

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About how far did the animal travel in 1 second? Calculate : The distance an animal travels each second is its speed. What is the estimated speed of this animal? Measure : You can get a more accurate estimate of distance and time using these steps:. Use the Time slider to position the animal so that its nose is even with the first tree. Record the current time in the table below as Time 1.Over the past two years ExploreLearning has built up the team that produces science Gizmos.

As we develop new Gizmos, we have concentrated on several themes within each subject. In chemistry we focused on chemical and nuclear reactions, including the recent Chemical ChangesReaction Energyand Nuclear Reactions Gizmos. Erosion Rates is a unique simulation that allows students to model erosion in a realistic 3D landscape. Engineering is a major emphasis in the new science standards, and we are working to create Gizmos that allow students to design solutions to real-world problems.

The Genetic Engineering Gizmo allows students to create corn plants that are resistant to insects and tolerant of herbicides. In the follow-up GMOs and the Environment Gizmo, students explore the impact these altered crops have on local ecosystems.

We are currently developing engineering Gizmos that address automobile safety and using chemical processes to release or absorb heat. In the coming months keep an eye out for Gizmos on honeybees, cladograms, the periodic table, and atomic mass.

Also coming is a new math Gizmo called Lucky Ducks, which will teach probability and expected value in a carnival setting. Can you help Arnie the Carny make a profit? This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More. Still trying to get the Green Light. ExploreLearning expands distance and remote learning resources. Gizmos to Go Project 2: What are the Even now, Reflex works.

Gizmo of the Week: Critter Count. Reflex helps in these uncertain times. Digital solutions offer opportunities. The making of a math leader. Introducing Gizmos to Go. Getting to the Green Light quicker. Featured Article Gizmos News. Have a great school year and enjoy the new Gizmos! Gizmos science. Facebook Twitter Pinterest Linkedin Email. Related Posts. ExploreLearning expands distance and remote Gizmos to Go Project Gizmo of the Week: Critter Gizmo of the Week: Honeybee Gizmo of the Week: Simple New Gizmo: Sticky Molecules.June 04, Student Exploration: Calorimetry Lab.

Where have you heard the word calorie before? What do you think a calorie is? Gizmo Warm-up. A calorimeter is an insulated container filled with a liquid, usually water. When a hot object is placed in the calorimeter, heat energy is transferred from the object to the water and the water heats up. How much did the temperature of the copper change?

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How much did the temperature of the water change? Which substance has a greater specific heat capacity, copper or water? Question: What factors determine how heat energy transfers between objects.

Collect data: Use the Gizmo to determine the final temperature for each set-up listed below. Record your results in the tables. In the third table, you change the initial temperature of the copper. The first row of each table has been completed for you. Analyze: For each factor listed in the chart below, explain how the final temperature was changed and why you think that change occurred. What was the effect of changing the initial temperature of the copper?

How does changing the initial mass of the copper affect how much heat energy it has? How does changing the initial temperature of the copper affect how much heat energy it has. Apply: Many gyms and health clubs have steam saunas, which are small steam-filled rooms.

Traditionally, steam saunas have a container of heated rocks. A small ladle of water is poured on the rocks in order to make the steam.

Use what you have learned so far about heat transfer to explain how hot rocks can be used to make steam. Why do you think only a small ladle-full of water is poured on the rocks at one time?

student exploration cladograms answer key

Question: How can you compare the specific heat capacities of various substances? Explain : How do you think you can use the calorimeter to compare the specific heat capacities of the substances listed on the Gizmo?

Predict: Which substance do you think will have the highest specific heat capacity? Experiment: Use the Gizmo to determine the final temperature for each set-up listed below. Record your results in the table. The first row has been completed for you. Analyze: Of the three substances, which caused the largest temperature change in the water? What does this indicate about its relative specific heat capacity. The more resistant a substance is to temperature change, the higher is its specific heat capacity.

Rank the three substances in order of their specific heat capacities, from highest to lowest.


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