Traits - Center For Teaching & Learning
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3rd Grade PSI Inheritance of Traits
Slide 3 / 48 Table of Contents: Inheritance of Traits
? Traits ? Inheritance of Traits ? Variation of Traits ? Environmental Effects on Traits ? Summary
Click on the topic to go to that section
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What is a trait?
A trait is a characteristic of a living organism.
Can you name 5 traits of the lion?
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Traits
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Slide 6 / 48 Genetic Traits
The lion has many traits. You probably said things like: .....he has a thick mane .....he has two eyes .....his chin has white hair .....his mane is brown and gray These are traits he got from his parents. We call them Genetic Traits.
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Genetic Traits
How many traits can you name about this dog?
Slide 8 / 48 Can you compare the traits of these dogs?
Answer
They have many traits in common, because they are all dogs. Do you think these dogs have the same parents? Why?
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Instincts
Instincts are traits that are passed to offspring.
This puppy is very young, but it has an instinct to howl. An instinct is a useful behavior.
Click on the image to listen to the puppy. What else do you notice the puppy doing when he is howling?
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1 Which of the following would be a trait of this animal?
A long whiskers B curly fur C mammal D pink eyes
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2 Can an instinct be a trait? Yes No
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3 An instinct is ____________ behavior. A a useful B not a useful
Answer
Answer
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4 A raccoon washing his food before he eats it is an example of __________.
A a trait B an instinct C both a trait and an instinct
Answer
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Mustard Seed Lab
Later in this unit, you will learn about how the environment can affect organisms. Right now, you will
setup an experiment with mustard seeds that will study this concept. You will continue to observe your
mustard seeds throughout the unit.
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Inheritance of Traits
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Offspring
Living things reproduce and create offspring that are similar to themselves.
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Traits are passed from parents to offspring
It is possible to look at traits and determine which baby belongs to which parent, because they have similar traits.
Let's look at a drawing of a cow to determine the important traits. For example, the size of the ears varies between types of cows.
Although there aremany similarities, there may also be some differences. Do you know why?
Slide 18 / 48 Offspring are similar to their parents.
Can you match the parent to the offspring?Below are pictures of adult cows (top) and baby calves (bottom). Can YOU find each matching
calf and mother or father? Look for details!!
What are other characteristics do you think are important to look at?
Draw a line from the parent to the offspring.
Answer
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5 Find the offspring of this mother dog.
A
B
C
D
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7 Can a whale only have whale offspring? Yes No
Answer
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6 Which is not a direct trait passed on from this bird's parents? A It has a long neck. B It has feathers. C It has long thin legs. D It is 3 years old.
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Variation of Traits
Answer
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Are all offspring from the same parents exactly alike?
Look closely at these ducklings. They have the sameparents. There are small differences between each duckling. Can you name some differences?
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Variations
We call these differences variations.
These puppies have the same parents, yet there is a lot of variation between
these puppies.
Can you describe the variations?
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Reasons For Variation
Some variation is because traits have many possibilities.This is called a "range of traits."These flowers are Petunias. There are many possible colors of Petunias. What flower colors do you see?
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Human Hair Color
There is a large range of human hair color. Of course, only the natural colors are genetic traits.
Can you point out the hair color that is not
genetic?
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8 Which is NOT an example of a variation of traits?
A A different shade of brown fur B Tall, medium and short plants C chosing to study hard D purple and pink flowers on the same plant
Answer
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9 Offspring are usually _________ one another. A exactly alike B completely different from C similar to
Answer
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10 In the diagram of human skin color, there are 36 possible colors shown. Does skin color have variation?
Yes
No
Answer
Slide 30 / 48 Variations of Traits Lab: Teacher Page
Obj: Students will determine the offspring of a set group of parents. Materials: What Kind of Slythy Toveactivity sheet
1. Give students a copy of theWhat Kind of Slythy Toveactivity sheet. 2. Guide the students in following the directions on the lab sheet.
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