Name: Class: Date: (C) Bethany Lau 2016 Dominant and Recessive Alleles of the Same Gene Read each scenario and answer the questions below. A scientist breeds a family of white mice. The father mouse was white, the mother mouse was white, and all of the baby mice were white. Both parents had parents who were white. Label the family below. X -> 1. Phenotype: __________ 2. Genotype: ___________ 3. Phenotype: _________ 4. Genotype: ___________ 5. Phenotype: _________ 6. Genotype: ___________ The scientist then breeds a family of gray mice. The father mouse, the mother mouse, and the baby mice are all gray. Both parents had parents who were gray. Label the family below. X -> 8. Phenotype: _________ 9. Genotype: ___________ 10. Phenotype: _________ 11. Genotype: ___________ 12. Phenotype: _________ 13. Genotype: ___________ 14. Is this a true-breeding family? Why or why not? __________________________________________________________________________________________________________________ 7. Is this a “true-breeding” family? Why or why not? __________________________________________________________________________________________________________________ The scientist then takes one of the white progeny from experiment 1 and mates it to one of the gray progeny mice from experiment 2. All of the baby mice are gray. Label the family below. X -> 15. Phenotype: _________ 16. Genotype: ___________ 17. Phenotype: _________ 18. Genotype: ___________ 19. Phenotype: _________ 20. Genotype: ___________ 21. Which allele is dominant, the allele for white fur or the allele for gray fur? Explain your answer below. __________________________________________________________________________________________________________________ 22. The scientist performs another experiment with two true-breeding mice of different breeds, one with long whiskers and one with short whiskers. All of their progeny have short whiskers. Which allele is dominant? Which allele is recessive? How do you know? __________________________________________________________________________________________________________________ __________________________________________________________________________________________________________________
Transcript
Name: Class: Date:
(C) Bethany Lau 2016
Dominant and Recessive Alleles of the Same GeneRead each scenario and answer the questions below.
A scientist breeds a family of white mice. The father mouse was white, the mother mouse was white, and all of the baby mice were white. Both parents had parents who were white. Label the family below.
X ->1. Phenotype: __________
2. Genotype: ___________
3. Phenotype: _________
4. Genotype: ___________
5. Phenotype: _________
6. Genotype: ___________
The scientist then breeds a family of gray mice. The father mouse, the mother mouse, and the baby mice are all gray. Both parents had parents who were gray. Label the family below.
X ->8. Phenotype: _________
9. Genotype: ___________
10. Phenotype: _________
11. Genotype: ___________
12. Phenotype: _________
13. Genotype: ___________
14. Is this a true-breeding family? Why or why not?
The scientist then takes one of the white progeny from experiment 1 and mates it to one of the gray progeny mice from experiment 2. All of the baby mice are gray. Label the family below.
X ->15. Phenotype: _________
16. Genotype: ___________
17. Phenotype: _________
18. Genotype: ___________
19. Phenotype: _________
20. Genotype: ___________
21. Which allele is dominant, the allele for white fur or the allele for gray fur? Explain your answer below.
22. The scientist performs another experiment with two true-breeding mice of different breeds, one with long whiskers and one with short whiskers. All of their progeny have short whiskers. Which allele is dominant? Which allele is recessive? How do you know?
Dominant and Recessive Alleles of an Autosomal GeneRead each scenario and answer the questions below. If an allele’s abbreviation isn’t given, make up your own. If you find out that the allele is recessive (later on the page) go back and fix your allele notation to use lower case for recessive alleles and upper case for dominant alleles
A scientist breeds a family of white mice. The father mouse was white, the mother mouse was white, and all of the baby mice were white. Both parents had parents who were white. Label the family below.
X ->1. Phenotype: __________
2. Genotype: ___________
3. Phenotype: _________
4. Genotype: ___________
5. Phenotype: _________
6. Genotype: ___________
The scientist then breeds a family of gray mice. The father mouse, the mother mouse, and the baby mice are all gray. Both parents had parents who were gray. Label the family below.
X ->8. Phenotype: _________
9. Genotype: ___________
10. Phenotype: _________
11. Genotype: ___________
12. Phenotype: _________
13. Genotype: ___________
14. Is this a true-breeding family? Why or why not?
The scientist then takes one of the white progeny from experiment 1 and mates it to one of the gray progeny mice from experiment 2. All of the baby mice are gray. Label the family below.
X ->15. Phenotype: _________
16. Genotype: ___________
17. Phenotype: _________
18. Genotype: ___________
19. Phenotype: _________
20. Genotype: ___________
21. Which allele is dominant, the allele for white fur or the allele for gray fur? Explain your answer below.
22. The scientist performs another experiment with two true-breeding mice of different breeds, one with long whiskers and one with short whiskers. All of their progeny have short whiskers. Which allele is dominant? Which allele is recessive? How do you know?
Yes, a true-breeding family means for generations, all individuals have the same phenotype and same homozygous genotype
gray gray gray
GG GG GG
Yes, a true-breeding family means for generations, all individuals have the same phenotype and same homozygous genotype
gray
GG
white
gg
gray
Gg
Gray is dominant. When you cross two homozygotes together and get heterozygotes, the heterozygote is gray.
When you cross two true-breeding (homozygotes) mice, and all progeny (heterozygotes) have short whiskers, that
tells you that the short whiskers allele is dominant. The long whiskers is recessive.
(C) Bethany Lau
TErms of UseThank you so much for purchasing one of my teaching resources! I work hard to create the best quality content for my students and I hope this resource helps you teach in your classroom. If you have any questions, concerns, or find any typos, please email me at [email protected]. Customer satisfaction is very important to me!
If you like this resource, please stop by my store and leave feedback! You can find your purchases by going to “My Purchases” under your account on Teachers Pay Teachers. You earn credit towards future purchases every time you leave feedback!
Purchasing my teaching resources allows you to:
* make copies for your own classes only.* place this file on your own password-protected class page or server (Blackboard, Google Drive,etc) AS LONG AS no other teacher has access to that class webpage.
This resource is for you, the purchaser, alone. By purchasing my teaching resource, you ARE NOT ALLOWED TO:* make copies other teachers or their classes.* distribute this digital resource to other teachers. You can pu* post this resource on any webpage or server that is available for public view, for otherteachers.If you and a team of teachers would like to use this resource together, please purchaseadditional licenses (at half price!) on the resource purchase page.Failure to comply with these terms of use is a copyright infringement and a violation of theDigital Millennium Copyright Act (DMCA). Clipart and elements found in this PDF are copyrightedand cannot be extracted and used outside of this file without permission or license.
I have created many of my own graphics for my resources using Adobe Illustrator. Other graphics in my resources are licensed and used with permission from the following artists/sources:
Adobe Stock/Dollar Photo Club, StockUnlimited.com
Getting Nerdy with Mel and Gerdy Teachers Resource Force
