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Genetics I
Pre/post Test key with citations
Name ________________________________________
January 26, 2013
• SC.912.L.16.1* Use Mendel's laws of segregation and independent assortment to analyze
patterns of inheritance. (HIGH)
• SC.912.L.16.2* Discuss observed inheritance patterns caused by various modes of
inheritance, including dominant & recessive ( simple inheritance) & co-dominant, sexlinked, polygenic, and multiple alleles (complex inheritance). (HIGH)
____1. Which of the following describes part of a phenotype?
A.
B.
C.
D.
Gg
Homozygous
Having freckles
Heterozygous
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____2. Which of the following describes an organism that has two different alleles for a trait?
A.
B.
C.
D.
Heterozygous
Homozygous
Dominant
Recessive
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____ 3.In rabbits, the allele for black coat is dominant over the allele for a brown coat. If a
rabbit is homozygous for brown fur, what is the genotype?
A.
B.
C.
D.
BB
bb
Bb
B
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_____4. Which of Mendel’s laws best explains why genetic variations occur in offspring
resulting from sexual reproduction?
A.
B.
C.
D.
Law of segregation
Law of dominance
Law of independent assortment
Law of crossing over
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_____ 5. Tallness (T) is a dominant trait in pea plants, and shortness (t) is recessive. How can
you determine the genotype of a tall pea plant?
A.
B.
C.
D.
Compare it with another offspring of the same parent plants
Do a test cross with a short pea plant
Do a test cross with another tall pea plant
Examine the pods produced after the pea plant flowers
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_____ 6. In a genotype for plant height, such as Tt, what does each letter represent?
A.
B.
C.
D.
one genome
one gene
one allele
one gamete
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_____7. Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who
does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb.
What is the probable genotypic ratio of their children?
A. 0% Hh: 100% hh
B. 50% Hh: 50% hh
C. 75% Hh: 25% hh
D. 100% Hh: 0% hh
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_____8. Mendel hypothesized that reproductive cells have only one factor for each inherited
trait. This hypothesis is supported by which observation?
A. Haploid cells are produced by mitosis.
B. Diploid cells are produced by mitosis.
C. Haploid cells are produced by meiosis.
D. Diploid cells are produced by meiosis.
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_____9. A distinguishing characteristic that can be inherited is a(n)
A.
B.
C.
D.
Cross
Allele
Gene
Trait
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_____10. Which of the following statements is true of homozygous alleles?
A.
B.
C.
D.
They are always inherited together.
They are different forms of the same trait.
They are identical forms of the same gene.
They are identical forms of two different genes.
2012 FL Holt McDougal Biology
_____11. A Di-hybrid cross for hairy knuckles (H = hairy, h = no hair) and oversized thumbs (T
= oversized, t = normal):
Question: The result in the box labeled
X would have which phenotype?
A. Hairy and oversized:
JimB.TheHairy and normal size:
C. Hairless and oversized:
D. Hairless and normal size:
Ee
HT
HT
Ht
Ht
hT
HHTT
X
hT
ht
Master teacher produced.
_____ 12. Which of the following phrases describes the Punnett square in Figure 6.1?
A.
B.
C.
D.
1/4 probability of heterozygous offspring
monohybrid heterozygous-heterozygous cross
3/4 probability of homozygous offspring
dihybrid heterozygous-heterozygous cross
2012 FL Holt McDougal Biology
ht
hhtt
____13. Mendel knew that the variations in the offspring generations resulted from his
experiments because he
A.
B.
C.
D.
allowed plants to cross-pollinate.
ensured that plants self-pollinated.
controlled the fertilization process.
changed the growing conditions.
2012 FL Holt McDougal Biology
_____14. Recessive alleles may not be expressed because they are
A.
B.
C.
D.
masked by a dominant allele.
the least common allele in a population.
the most common allele in a population.
less likely to have crossing over.
2012 FL Holt McDougal Biology