Using Key Terms
1.The offspring of true-breeding parents are
called the
a.F 1 generation.
b.F 2 generation.
c.dominant offspring.
d.recessive offspring.
2.The color of a dog’s coat is the dog’s
a.dominance. c.phenotype.
b.pedigree. d.genotype.
3.The unknown genotype of an individual
with a dominant phenotype can be deter-
mined using
a.a ratio. c.probability.
b.a dihybrid cross. d.a test cross.
4.A trait with two dominant alleles that are
expressed at the same time is
a.codominant.
b.mutational
c.incompletely dominant.
d.polygenic.
5.For each pair of terms, explain the differ-
ences in their meanings.
a.dominant, recessive
b.homozygous, heterozygous
c.law of segregation, law of independent
assortmentUnderstanding Key Ideas
6.The scientist whose studies formed the
basis of modern genetics is
a.T. A. Knight. c.Louis Pasteur.
b.Gregor Mendel. d.Robert Hooke.
7.Which of the following is nota good reason
why Pisum sativummakes an excellent
subject for genetic study?
a.Many varieties exist.
b.They require cross-pollination.
c.They grow quickly.
d.They demonstrate complete dominance.
8.If smooth peas are dominant over wrinkled
peas, the allele for smooth peas should be
represented as
a.W. b.S. c.w. d.s.9.The law of segregation states that pairs of
alleles
a.separate when gametes form.
b.separate independently of one another
during gamete formation.
c.are always the same.
d.are always different.
10.The trait shown below isa.sex-linked and dominant.
b.autosomal and dominant.
c.sex-linked and recessive.
d.autosomal and recessive.
11.D, dimples, is the dominant allele to the
recessive allele, d, no dimples. The proba-
bility of parents with Ddand ddgenotypes
having a child with no dimples (dd) is
a.^18 . c.^12 .
b.^14 . d.1.12.Explain how working genes have been
inserted into defective cells during gene
therapy.
13.Relate the events of meiosis to the law of
segregation. (Hint: See Chapter 7, Section 1.)- State the genotypic and
phenotypic ratios that would result from
a cross between two YyRRpea plants. - Concept MappingMake a concept
map about Mendel’s experiments. Try to
include the following words in your map:
Pisum sativum,P generation, F 1 generation,
F 2 generation, dominant trait, andrecessive
trait.
Performance
ZONE
184 CHAPTER 8 Review
CHAPTER REVIEW
3F6C6A 6D6E2C 3E6D6D6D6D6D6D6D6D