medelian genetics and how to use a punnett square to predict probable offspring
TRANSCRIPT
![Page 1: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/1.jpg)
Medelian Genetics
and
How to use a Punnett Square
to predict probable offspring
![Page 2: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/2.jpg)
Simple Steps to follow
1. Determine the parental phenotype and genotypes of the traits being crossed.
2. Determine the possible gametes from the parents in #1.
3. Use the gametes to fill the outside of a blank Punnett Square.
4. Complete the inside of the Punnett Square.
![Page 3: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/3.jpg)
More Steps…
5. Count the number of possible genotypes found in the Punnett Square.
6. Determine the percentage of genotypes found.
7. Determine the phenotypes (based on the genotypes) and percentages from the Punnett Square.
8. Celebrate – you’re done!
![Page 4: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/4.jpg)
Example. . .Oompah Loompah Genetics
![Page 6: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/6.jpg)
Step 1.
Phenotype = Face Color (F) Dominant = Recessive =
BLUE ORANGE
Genotype = Genetic make-up Dominant = Recessive =
FF or Ff ff
Dad Mom
![Page 7: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/7.jpg)
Step 2 . Determine possible gametes
Genotype = FF or Ff Genotype = ff
Gamete = F F or fGamete = f
Let’s use the heterozygous dad to find out what possible offspring they might have.
![Page 8: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/8.jpg)
Step 3. Fill in gametes outside of Punnett Square
f f
F
f
Mom
Dad
![Page 9: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/9.jpg)
Step 4. Fill in inside of Punnett Square
f f
F
f
Ff Ff
ff ff
![Page 10: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/10.jpg)
Step 5. Count the number of possible offspring genotypes found in the Punnett Square.
f f
F Ff Ff
f ff ff
Genotypes:
Ff =
ff =
2 out of 4
2 out of 4
= 50%
= 50%
Step 6: Determine percentages - done above!
![Page 11: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/11.jpg)
Step 7. Determine offspring phenotypes and percentages
Genotypes are:
Ff = 2/4 = 50% and ff = 2/4 = 50%
Phenotypes are:
Ff = BLUE face = 2/4 = 50%
ff = ORANGE face = 2/4 = 50%
![Page 12: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/12.jpg)
Summary
Crossing a blue face Oompah Loompah with an orange face Ompah Loompah may produce 50% blue-faced children and 50% orange-faced children
![Page 13: Medelian Genetics and How to use a Punnett Square to predict probable offspring](https://reader035.vdocuments.mx/reader035/viewer/2022081420/55149deb550346f06e8b58cc/html5/thumbnails/13.jpg)
Make Sense???
Try the Oompah Loompah worksheet!