HONORS BIOLOGY
GENETICS REVIEW
Ch. 9 Genetics
1. Draw a diagram of a person undergoing pangenesis.
2.
If a plant self-pollinates and produces only offspring that look like the parent, what do
you know about the genotype of the parent?
3.
What is the difference between:
a. genotype
b.
4.
6.
phenotype?
For a Mendelian monohybrid cross, what is the F2:
a. phenotypic ratio
b.
Where does the “Central Dogma” fit into your
explanation?
7.
For a Mendelian dihybrid cross, what is the F1:
a. phenotypic ratio
b.
5.
For a Mendelian monohybrid cross, what is the F1:
a. phenotypic ratio
b.
9.
genotypic ratio
8.
10. If you have a dominant animal of unknown genotype,
what would you do to determine whether it is
homozygous dominant or heterozygous?
11. If the animal is a fruit fly, and it has 100 offspring that
are all dominant for the trait in question, what is the
genotype of the dominant parent?
genotypic ratio
For a Mendelian dihybrid cross, what is the F2:
a. phenotypic ratio
b.
Omitting sister chromatids, draw a picture of
homologous chromosomes, heterozygous for the
genes a and b.
genotypic ratio
genotypic ratio
17. Describe the heterozygote advantage for sickle-cell
allele.
18. What is pleiotropy?
19. Give an example of pleiotropy.
20. What type of inheritance pattern is the opposite of
pleiotropy?
12. If the animal is a cow, and it has five calves that are
all dominant for the trait, what is the genotype of the
dominant parent?
21. What mechanism unlinks linked genes?
13. What is the probability that each was heterozygous?
a. fruit fly
b. cow
22. Give three examples of human sex-linked traits.
14. Why would someone have amniocentesis or CVS
done?
15. How does a codominant trait express itself?
16. Give an example of a codominant trait.
Mrs. Loyd 
cloyd@waukee.k12.ia.us
23. What makes them sex linked?
24. Why are males more often affected by sex-linked
traits than females?
25. How can scientists claim that 8% of men currently
living in Central Asia may be descended from the
Mongolian ruler Genghis Khan?
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