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Unit 6 Study Guide
HEREDITY
ENDURING UNDERSTANDINGS:
Cellular processes maintain homeostasis.
Proteins determine the structure and function of
living things.
Nucleic acids transfer genetic information from
generation to generation.
Objective 8: HEREDITY
Interpret the role of genetics in determining heredity
and as it applies to biotechnology.
Essential Questions:
7) Do I carry deadly genes? (heredity, meiosis)
8) How do they make seedless watermelons?
(heredity)x
SELF-ASSESSMENT CHART
U = Unfamiliar (I can apply this target to a new situation.)
F = Familiar (I can apply this target to a present or prior situation.)
O = Objective Target (I can identify the target in a situation.)
TARGET
1) Review classical Mendelian genetics.
2) Apply Punnett squares to determine the probability of
a. possible genotypes in parents and offspring.
b. possible phenotypes in parents and offspring.
3) Predict genetic variations in parents and offspring by
interpreting data involving
a. two factor crosses
b. co-dominance
c. sex-linked traits
d. multiple alleles
4) Analyze and identify karyotypes as normal or abnormal
and recognize such abnormalities
a. Down syndrome
b. Turner’s syndrome
c. Klinefelter’s syndrome
5) Analyze a pedigree chart to
a. identify familial relationships
b. trace inheritance of traits (including genotype and
phenotype)
c. predict probabilities in offspring.
U
F
O
LESSONS
Genetics & Heredity PPT
(mypisd)
Monohybrid Genetics
Problems
Determining Genotypic and
Phenotypic Ratios Lab
A Dog Called Spot
Dihybrid Genetics Problems
Blood Types Discussion
Notes
Long Lost Son
Advanced Genetics
Problems
Problems of Excess
Karyotype Study Guide
Karyotype Practice
Introduction. to Pedigrees
Pedigree Practice
SAMPLE TEST QUESTIONS
(These are samples of the type of questions which might be on the test. Questions may require students to use the
basic content to make applications, analyze, synthesize and evaluate information. Tests contain unit content
questions as well as general scientific processing questions.)
1. In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal
hearing is due to its dominant allele (D). What percentage of the offspring of a normal
heterozygous (Dd) dog and a deaf dog (dd) would be expected to have normal hearing?
A. 0%
B. 25%
C. 50%
D. 100%
Heredity Study Guide – Biology Student - (Revised June 19, 2009)
(printed 6/18/2017) p. 1
2. In humans, the gene for polydactyly (having extra fingers or toes) is dominant over the gene for the
normal number of digits. If parents who are both homozygous dominant for polydactyly have four
children, how many of these children would most likely have extra fingers or toes?
A.
B.
C.
D.
0
2
3
4
Figure 26
3. Look at Figure 26. The genotype of individual 1 could be
A. EE, only
B. Ee, only
C. ee
D. EE or ee
4. Look at Figure 26. The genotype of individual 2 could be
A. EE, only
B. Ee, only
C. ee
D. EE or ee
5. A rabbit with white fur was crossed with a rabbit with black fur. The cross produced offspring with
black and white fur. This type of inheritance is known as
A. dihybrid recessive.
B. dominance.
C. codominance.
D. multiple alleles.
6. Organisms that have two identical alleles for a particular trait are said to be
A. hybrid.
B. homozygous.
C. heterozygous.
D. dominant.
7. One plant has the genotype TT. The second plant has the genotype Tt. The two plants would
A. have the same phenotype.
B. have different phenotypes.
C. have the same genotype.
D. have all dominant alleles.
Heredity Study Guide – Biology Student - (Revised June 19, 2009)
(printed 6/18/2017) p. 2
TRIBBLE TRAITS
Tribble Traits
Gene
S
s
L
l
Trait
Solid coat (dominant)
Plaid coat (recessive)
Long fur (dominant)
Short fur (recessive)
Parental Generation: SSLI (male) x Ssll (female)
8. What trait will most likely be observed in all offspring of the above set of parents?
A. Solid coat color
B. Plaid coat color
C. Long fur
D. Short fur
9. A tribble with the genotype SsLL is crossed with a tribble with the genotype ssLl. How many
different genotypes can be expressed in the offspring?
A. 1
B. 2
C. 3
D. 4
KARYOTYPES
10. A karyotype such as the one pictured above shows which of the following?
A. autosomes
B. sex chromosomes
C. homologous chromosomes
D. all of the above
11. Using the karyotype above, identify the sex of this person and whether or not it is a normal or
abnormal karyotype.
A. female; normal
B. female; abnormal
C. male; normal
D. male; abnormal
Heredity Study Guide – Biology Student - (Revised June 19, 2009)
(printed 6/18/2017) p. 3
12. Genes in sex-linked traits are carried on the
A. X chromosome only
B. Y chromosome only
C. X and Y chromosome
D. Autosomes
13. Which of the genotypes would have the same blood type?
A. IBIB and IBi
B. IAIA and IAIB
C. IBi and ii
D. IBIB and IAIB
PEDIGREE INHERITANCE
14. The pedigree above shows that a certain disease was found equally in males and females and that
all children who had the disease had at least one parent who also had the disease. The gene
coding for the disease is probably
A. autosomal recessive
B. autosomal dominant
C. sex-linked recessive
D. sex-linked dominant
PEA PLANT CHARACTERISTICS
T=tall
T=short
S=smooth
s=wrinkled
15. If a plant that is homozygous tall and wrinkled is crossed with a short, wrinkled plant, which
percentage of genotypes would most likely be found in the first-generation offspring?
A. 50% TTss, 50% ttSS
B. 100% TtSs
C. 100% Ttss
D. 50% TtSS, 50% ttSS
16. Which of the following combinations would produce a normal human
male?
A. 22 + X and 22 + X
B. 23 + X and 23 + X
C. 22 + X and 22 + Y
D. 23 + X and 23 + Y
Heredity Study Guide – Biology Student - (Revised June 19, 2009)
(printed 6/18/2017) p. 4
Short Answer
17. Why can multiple alleles provide many different phenotypes for a trait?
18. Are an organism’s characteristics determined only by its genes? Explain.
19. Construct a pedigree using the following information: a family of five
generations that contains the gene for an autosomal recessive disorder.
At least 6 members of the family are affected.
20. Blood type is a trait controlled by multiple alleles which are A(IA), B(IB)
and O. A and B are dominant over O(i), which is recessive. If one parent is blood type AB and
another is blood type O, what would be the probable genotypes of their offspring? Show your work
in a Punnett square.
Heredity Study Guide – Biology Student - (Revised June 19, 2009)
(printed 6/18/2017) p. 5