ch 5.1 mendel's experiments with peas
DESCRIPTION
MendelTRANSCRIPT
![Page 2: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/2.jpg)
How are traits passed from parents to offspring?
![Page 3: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/3.jpg)
Focus Questions:
1. What were the results of Mendel’s experiments with pea plants?
2. What did Mendel conclude about inherited traits?
3. How do dominant and recessive factors interact?
![Page 4: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/4.jpg)
• People used to believe in the idea of blending
inheritance (traits mixing like colors of paint).
Today, we know that heredity is more complex.
Heredity – the passing of traits from parents to
offspring.
• Genetics – the study of heredity (how traits are passed from parents to offspring).
Early Ideas About Heredity
1. What were the results of Mendel’s experiments with pea plants?
![Page 5: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/5.jpg)
Lesson 1
• Gregor Mendel did experiments to disprove this idea of blending inheritance, and later became known as “the father of genetics”.
• Mendel used white and purple pea plants for his controlled breeding experiments.
Early Ideas About Heredity
1. What were the results of Mendel’s experiments with pea plants?
![Page 6: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/6.jpg)
Lesson 1
• There are 2 types of pollination:
• self-pollination – pollen from one plant lands on the flower’s pistil of the same plant
• cross-pollination – when wind, water, or animals carry pollen from one plant to the pistil of another plant
1. What were the results of Mendel’s experiments with pea plants?
![Page 9: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/9.jpg)
Lesson 1
• Mendel’s experiment:
1. Self-pollinated true-breeding (purebred) plants
a) Result: offspring were identical to parent plant (same exact traits)
1. What were the results of Mendel’s experiments with pea plants?
![Page 10: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/10.jpg)
What happens when a true-breeding plant self-pollinates?
A. One of its offspring has the same traits as the parent.
B. Some of its offspring have the same traits as the parent.
C. All of its offspring have the same traits as the parent.
D. None of its offspring have the same traits as the parent.
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![Page 11: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/11.jpg)
Lesson 1
• 1st generation crosses:
1. Cross-pollinated different colors of true-breeding (purebred) plants
a) Purple + Purple = ?
b) White + White = ?
c) Purple + White = ?
* Fill in results from next slide
1. What were the results of Mendel’s experiments with pea plants?
![Page 12: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/12.jpg)
Lesson 1
First-Generation Crosses Results
![Page 13: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/13.jpg)
Lesson 1
• 2nd generation hybrid crosses:
* hybrid – different version of the same trait (the resulting offspring from crossing purple w/ white)
1. Cross-pollinated 2 purple hybrid plants
a) Purple hybrid + Purple hybrid = ?
* Fill in results from next slide
1. What were the results of Mendel’s experiments with pea plants?
![Page 14: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/14.jpg)
Lesson 1
Second-Generation (Hybrid) Crosses
![Page 15: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/15.jpg)
Lesson 1
• Mendel observed the same results when he cross-pollinated pea plants for other traits too.
• He observed that offspring of hybrid crosses always showed traits in a 3:1 ratio.
2. What did Mendel conclude about inherited traits?
![Page 16: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/16.jpg)
Mendel’s Results
Lesson 1
Mendel recorded traits of offspring from many hybrid crosses.
![Page 17: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/17.jpg)
Lesson 1
Mendel concluded that 2 factors (1 from sperm and 1 from egg) control each inherited trait.
Mendel’s Conclusions
3. How do dominant and recessive factors interact?
![Page 18: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/18.jpg)
Why were ratios important in Mendel’s work?
A. They showed that
heredity does not follow a
set pattern.
B. They showed that some
traits are never passed
on.
C. They showed the
relationship between two
different things.
D. They showed that some
recessive traits are really
dominant.
45
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They show
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They show
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They show
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.
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Lesson 1
• dominant trait: blocks another genetic factor.
– Written with a Capital letter
• recessive trait: blocked by the presence of a dominant factor.
– Written with a Lowercase letter
3. How do dominant and recessive factors interact?
![Page 20: Ch 5.1 Mendel's Experiments with Peas](https://reader033.vdocument.in/reader033/viewer/2022052623/559d33e01a28ab056b8b46f5/html5/thumbnails/20.jpg)
What method did Mendel use to select which
plants pollinated other plants?
A. true breeding
B. self-pollination
C. cross-pollination
D. bees
true b
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self-
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-polli
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How many dominant factors does a purple-
flowering pea plant have?
A. 0
B. 1
C. 2
D. 1 or 2
0 1 2
1 or 2
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What is the approximate ratio of dominant to
recessive expression when both parents are
hybrid?
A. 1 : 1
B. 2 : 1
C. 3 : 1
D. 4 : 1
1:01
2:01
3:01
4:01
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