Test
CHAPTER 8 Review 185Critical Thinking
- Evaluating ResultsMendel based his
conclusion about inheritance patterns on
experiments involving large numbers of
plants. Why do you think the use of large
numbers of individuals is advantageous
when studying patterns of inheritance? - Inferring RelationshipsAlbinism is rare
among wild animals but common among
some domesticated species. What factors
might account for this difference? - Justifying ConclusionsA 20-year-old man
who has cystic fibrosis has a sister who is
planning to have a child. The man encour-
ages his sister to see a genetic counselor.
What do you think the man’s reasons are
for giving such advice? - Predicting ResultsHow might research
that demonstrates a genetic basis for some
aspects of human behavior impact society?
Alternative Assessment
- Technology and LearningFind out how
new technologies have changed plant-
breeding methods since Mendel’s time.
Prepare an oral report to summarize
your findings. Or create a display that
compares the methods and equipment
Mendel might have used with those used
by plant breeders today. - Career Connection Genetic Counselor
Research the field of genetic counseling,
and write a report on your findings. Your
report should include a job description,
training required, kinds of employers,
growth prospects, and starting salary. - Interactive Tutor Unit 5HeredityWrite a
report summarizing how an understand-
ing of heredity allows animal breeders to
develop animals with desirable traits.
Find out what kinds of animals are bred
for special purposes.
The diagram below shows the expected results
of a cross between two pea plants. Tand t
represent the alleles for the tall and dwarf traits,
respectively. Use the diagram and your knowl-
edge of science to answer questions 1–3.1.What are the genotypes of the plants that
were crossed?
A tton the top; ttalong the side
B Tton the top; ttalong the side
CTton the top; Ttalong the side
DTTon the top; TTalong the side2.What genotypic ratio is expected in the
offspring of this cross?
F 1 Tt: 1 tt
G 3 Tt: 1 tt
H 1 Tt: 3 tt
J 1 TT: 1 tt
3.If this cross produced 240 offspring, how
many of the offspring would be expected to
have the dwarf trait?
A 0
B 60
C 120
D 180Scan the answer set for words such as “never” and
“always.” Such words often are used in statements
that are incorrect because they are too general.Tttt????TtttThe diagram below shows the expected results
of a cross between two pea plants. Tand t
represent the alleles for the tall and dwarf traits,
respectively. Use the diagram and your knowl-
edge of science to answer questions 1–3.1.What are the genotypes of the plants that
were crossed?
A tton the top; ttalong the side
B Tton the top; ttalong the side
CTton the top; Ttalong the side
DTTon the top; TTalong the side2.What genotypic ratio is expected in the
offspring of this cross?
F 1 Tt: 1 tt
G 3 Tt: 1 tt
H 1 Tt: 3 tt
J 1 TT: 1 tt
3.If this cross produced 240 offspring, how
many of the offspring would be expected to
have the dwarf trait?
A 0
B 60
C 120
D180.TAKS Test PrepTAKS Test Prep
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