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.
Gg
B.
Homozygous
C.
Having freckles
D.
Heterozygous
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____2. Which of the following describes an organism that has two different alleles for a trait?
A.
Heterozygous
B.
Homozygous
C.
Dominant
D.
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.
BB
B.
bb
C.
Bb
D.
B
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_____4. Which of Mendel’s laws best explains why genetic variations occur in offspring resulting from sexual reproduction?
A.
Law of segregation
B.
Law of dominance
C.
Law of independent assortment
D.
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.
Compare it with another offspring of the same parent plants
B.
Do a test cross with a short pea plant
C.
Do a test cross with another tall pea plant
D.
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. one genome
B. one gene
C. one allele
D. one gamete
2012 FL Holt McDougal Biology
_____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 http://ecsd-fl.schoolloop.com/L.16.1

_____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.
Cross
B.
Allele
C.
Gene
D.
Trait
2012 FL Holt McDougal Biology
_____10. Which of the following statements is true of homozygous alleles?
A. They are always inherited together.
B. They are different forms of the same trait.
C. They are identical forms of the same gene.
D. 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:
HT
HT
HHTT
Ht hT ht
C.
Hairless and oversized:
Ee
D.
Hairless and normal size:
Master teacher produced.
Ht hT ht
X
_____ 12. Which of the following phrases describes the Punnett square in Figure 6.1? hhtt
A. 1/4 probability of heterozygous offspring
B. monohybrid heterozygous-heterozygous cross
C. 3/4 probability of homozygous offspring
D. dihybrid heterozygous-heterozygous cross
2012 FL Holt McDougal Biology

____13. Mendel knew that the variations in the offspring generations resulted from his experiments because he
A. allowed plants to cross-pollinate.
B. ensured that plants self-pollinated.
C. controlled the fertilization process.
D. changed the growing conditions.
2012 FL Holt McDougal Biology
_____14. Recessive alleles may not be expressed because they are
A. masked by a dominant allele.
B. the least common allele in a population.
C. the most common allele in a population.
D. less likely to have crossing over.
2012 FL Holt McDougal Biology