CODOMINANCE.pptx

CODOMINANCE GRADE 9

1. InHeritance and variation

2. HELP ME OUT…

3. EXAMPLE OF CODOMINANCE For example, RB fish will have scales that are both red and blue .

4. -this result when one allele is not dominant over the other. CODOMINANCE -this resulting heterozygotes exhibit the traits of both parents. - when an organism has two different alleles (i.e., is a heterozygote), it’ll express both at the same time.

5. ACTIVITY 3.1 Ra- tio -Me Answer the following questions. Provide a Punnett square to support your answers where indicated. Express probabilities as percentages.  1. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as speckled/ erminette . A. What is the genotype for black chickens? B, What is the genotype for white chickens? C. What is the genotype for speckled/ erminette chickens? 2. If two speckled/ erminette chickens were crossed, what is the probability that: (use a Punnett square) They would have a black chick? B. They would have a white chick?

6. ACTIVITY 3.1 Ra- tio -Me                                 3. A black chicken and a white chicken are crossed. What is the probability that they will have speckled/ erminette chicks?                

7. Make a cross between a homozygous black cow and a black and white cow. Use the Punnett square to solve the problem and answer the guide questions.

8. GUIDE QUESTIONS: 1. What are the offspring in a cross between a homozygous black cow and a black and white cow? _______________________________________ 2. What are the possible genotypes? ___________________________________

9. CODOMINANCE

10. well done!