8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple...
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![Page 1: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/1.jpg)
8th Grade Do Now 11/17/2011• Essential Question – How can determine the
phenotypes for multiple alleles?• Objective –
– Identify what controls the inheritance of traits in an organism
– Explain the relationship between chromosomes and genes.
– Complete dihybrid and Punnett Squares to determine the traits of a genetic cross.
• Homework – Complete Solving Dihybrid and Complex Monohybrid Punnett Square Problems 1 – 6 and 8-11
• If you need help, please look at my website under Punnett Square tutorials for assistance.
• Do Now – Take out your vocabulary words and your Punnett Square Activity Packet and study it for five minutes.
YOU ARE HAVING A QUIZ TODAY!!
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Finished with your quiz?
• Turn it into your class period bin.• Pick up Complete Solving Dihybrid
and Complex Monohybrid Punnett Square Problems pages from the front table and staple them in order.
• Begin reading pages 330 – 333• DO NOT TALK UNTIL EVERYONE IS DO NOT TALK UNTIL EVERYONE IS
FINISHED WITH THE QUIZ!FINISHED WITH THE QUIZ!
![Page 3: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/3.jpg)
8th Grade Do Now 11/18/2011• Essential Question – How can determine the
phenotypes for multiple alleles?• Objective –
– Identify what controls the inheritance of traits in an organism
– Explain the relationship between chromosomes and genes.
– Complete dihybrid and Punnett Squares to determine the traits of a genetic cross.
• Homework – Complete Solving Dihybrid and Complex Monohybrid Punnett Square Problems 1 – 6 and 8-11
• If you need help, please look at my website under Punnett Square tutorials for assistance.
• Do Now – Do you think it is possible to use a Punnett Square to
determine more than one allele combination?
![Page 4: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/4.jpg)
Gene Interactions
Solving Dihybrid and Complex Monohybrid Punnett Square Problems
![Page 5: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/5.jpg)
![Page 6: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/6.jpg)
Monohybrid Crosses
• Up to now we have been doing monohybrid crosses
RR Rr
Rr rr
R r
R
r
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Dihybrid crosses• A dihybrid cross in involves studying
the inheritance of two traits simultaneously
• Mendel invented the dihybrid cross to determine if different traits, such as seed color and seed texture, were inherited independently or if they were somehow “linked” to each other
![Page 8: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/8.jpg)
Law of Independent Assortment
• When gametes are formed, the segregation of one gene pair (the Y’s) does not affect the segregation of the other gene pair (the R’s)
![Page 9: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/9.jpg)
YyRr
(yellow, round)Y = yellow
y = green
R = round
r = wrinkled
YR
yRYr
yr
These are the 4 gametes that can be made from this parent
You can also use the FOIL method!
![Page 10: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/10.jpg)
Solving the Squares• Cross a green, heterozygous
round parent with a heterozygous yellow, heterozygous round parent
• yyRr X YyRr
![Page 11: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/11.jpg)
yyRr X YyRr
1
9
5
13
2
10
6
14
3
11
7
15
4
12
8
16
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yyRr X YyRr
yR
yr
yr
yR
yryRYR Yr
YyRR
YyRR
YyRr
YyRr
YyRr
YyRr
Yyrr
Yyrr
yyRR
yyRR
yyRr
yyRr
yyRr
yyRr
yyrr
yyrr
![Page 13: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/13.jpg)
Phenotypes1 9
2 10
3 11
4 12
5 13
6 14
7 15
8 16
![Page 14: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/14.jpg)
Phenotypes1 Yellow round 9 Yellow round
2 Yellow round 10 Yellow round
3 Green round 11 Green round
4 Green round 12 Green round
5 Yellow round 13 Yellow round
6 Yellow wrinkled 14 Yellow wrinkled
7 Green round 15 Green round
8 Green wrinkled 16 Green wrinkled
![Page 15: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/15.jpg)
To find the Genotypic Ratio
• Write down all possible allele combinations.
• Count how many of each combination.
• If you wanted to find the fraction put that number over 16. (Reduce if necessary)
The Genotypic Ratio =2 YyRR : 4 YyRr : 2 Yyrr : 2 yyRR : 4 yyRr : 2 yyrr
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yyRr X YyRr
yR
yr
yr
yR
yryRYR Yr
YyRR
YyRR
YyRr
YyRr
YyRr
YyRr
Yyrr
Yyrr
yyRR
yyRR
yyRr
yyRr
yyRr
yyRr
yyrr
yyrr
![Page 17: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/17.jpg)
To Find the Phenotypic Ratio
• Write down all of the possible phenotypic allele combinations– For example:
– Yellow and Round
• Count how many of each combination there is.
The Phenotypic Ratio = 6 Yellow round : 6 green round : 2 yellow wrinkled :
2 green wrinkled
![Page 18: 8 th Grade Do Now 11/17/2011 Essential Question – How can determine the phenotypes for multiple alleles? Objective – –Identify what controls the inheritance.](https://reader036.fdocuments.us/reader036/viewer/2022062721/56649f1f5503460f94c37451/html5/thumbnails/18.jpg)
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