Genetics Test Review printable pdf download

Name ___________________________

Pd ______

Genetics Inheritance Review

Reminders:

*Review due the day of the exam (12/12/12)!

*Write your answers on a separate sheet of paper!

*Show ALL work for every genetics problem – Define Alleles  Parent

Genotypes  Gametes  Punnett Square (using gametes!)  Offspring

Genotypic Percentage  Offspring Phenotypic Percentage.

1. List the steps you need to follow to complete a genetics problem.

2. Define a monohybrid cross. What would be an example of a monohybrid cross?

3. Explain a dihybrid cross.

4. How is it different from a monohybrid cross? Give an example.

5. Be able to work complete dominance problems using the steps from #1.

6. In a complete dominance problem, in order for the recessive phenotype to be

seen, which allele do both parents need to carry?

7. How do you figure out the possible gametes when given a parent genotype?

8. Give the possible gametes for each genotype:

1. Aa ____________

2. BB ____________

3. cc _____________

4. AaBb __________

5. AABb _________

6. CCDD _________

9. What clues should you look for when reading a genetics problem to determine if it

exhibits complete dominance, incomplete dominance or co-dominance?

10. Name two key words that identify that a problem refers to incomplete dominance.

11. How many phenotypes can be expressed in incomplete dominance?

12. Give an example of 3 genotypes that are possible for incomplete dominance and

list their corresponding phenotypes.

13. Give three phenotypic examples of organisms expressing incomplete dominance.

Explain why each is a blend.

14. Guinea pigs can have white, black, or gray fur color. Two guinea pigs mate and

have 2 offspring. One has gray fur and one has white fur. What are the parent

genotypes that make this possible? Show all of your work (remember the 5

steps!).

15. If a parent’s genotype is HhTt, what are the possible gametes?

16. If two parents with genotype HhTt reproduce, what are the genotypic

percentages/ratios?

17. If straight hair (H) is dominant to curly hair (h) and a long tail (T) is dominant to

no tail (t), what are the phenotypic percentages/ratios of the above problem?

18. Answer the above questions for the following crosses:

1. Hhtt X hhTt

2. HHTt X HhTt

3. HhTT X hhTT

4. hhtt X hhtt

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Genetics Test Review

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