Unit 6 Review Sheet
(Optional)
Key Concepts:
- genotype vs. phenotype
- Punnett squares & word problems
- Mendel’s 3 principles
- observed vs. expected results
-
complex inheritance patterns (eg, sexlinkage)
pedigrees
vocab, vocab, vocab!
Vocabulary:
Refer to your unit 6 vocabulary sheet for a list of terms that you should know.
Readings Covered:
Pages 308 - 321. This is the majority of chapter 11 in your textbook.
What You Can Use During Your Test:
- #2 pencils
- your completed unit 6 vocabulary sheet
- one piece of white computer paper with hand-written notes, front and back
Practice Questions:
1. Different forms of a gene are called
a. hybrids
b. dominant factors
c. alleles
d. recessive factors
2. Organisms that have two identical alleles for a
particular trait are said to be
a. hybrid
b. heterozygous
c. homozygous
d. dominant
3. A Punnett square is used to determine the
a. probable outcome of a cross
b. actual outcome of a cross
c. results of incomplete dominance
d. results of meiosis
4. The physical characteristics of an organism are
called its
a. genetics
b. heredity
c. phenotype
d. genotype
5. A situation in which a gene has more than two
alleles is known as
a. complete dominance
b. codominance
c. incomplete dominance
d. multiple alleles
6. Two pink-flowering plants are crossed. The
offspring are 25% red, 25% white, and 50%
pink. What pattern of inheritance is this?
a. dominant/recessive
b. multiple alleles
c. incomplete dominance
d. polygenic traits
7. A pink-flowered Mirabilis (RW) is crossed with
a white-flowered Mirabilis (WW). Complete a
Punnett square illustrating this cross.
8. What is the chance that a seed from the cross
described in #7 above will produce a redflowered plant?
a. 0%
b. 25%
c. 50%
d. 100%
9. If we expect 50% of the children in a family to
be boys and 50% to be girls, how is it possible
to have a family of 4 girls? Explain.
Multiple Choice Answers: 1. C; 2. C; 3. A; 4. C; 5. D; 6. C; 8. A.
10. What is meant by true- or pure-breeding?
13. Construct a Punnett square showing the cross
between Matt and Amy.
11. Are an organism’s characteristic only
determined by its genes? Explain.
14. Given the Punnett square that you just
completed in #13, does it surprise you that only
one of the four Roloff children have
achondroplasia despite the fact that both
parents have the condition? Why or why not?
15. In the context of genetics, what is a hybrid?
12. Achondroplasia (dwarfism) is a dominant trait
found in the Roloff family. Matt Roloff
married Amy Roloff. They have a dwarf son
Zach, an average height son Jeremy, an average
height daughter Molly Jo, and an average son
Jake.
a. Construct a pedigree for the family.
b. Label the generations. (I, II)
c. Label the individuals. (1, 2, 3…)
d. Label the genotypes. (aa, Aa…)