Take-home portion of Exam 3.  The first 10 questions are from the Inheritance section and the second 10 are from the Evolution section.  On the day of Exam 3, bring a piece of paper to class with the numbered answers on it.

1. In which kind of cross would you expect to find a ratio of 3:1 among the F2 offspring? 
A. Monohybrid cross
B. Genotypic cross
C. Phenotypic cross
D. Test cross
E. Dihybrid cross
 
2.  What are alleles?  
A.  Genes for different traits, such as hair color and eye color
B.  Dominant forms of a kind of characteristic carried by genes
C.  Recessive forms of a kind of characteristic carried by genes
D.  The locations of genes on chromosomes
E.  Alternative forms of a gene for a single trait, such as blue eyes and brown eyes
 
3. Which of the following terms is represented by word descriptions, such as brown or tall? 
A. Phenotype
B. Homozygous
C. Allele
D. Genotype
E. Dominance
 
4. In humans, brown eyes (B) are dominant over blue eyes (b). A brown-eyed woman who has a blue-eyed child would have the genotype: 
A. Bb
B. BBB
C. BbBb
D. bb
E. BB
 
5. When an organism has two identical alleles for a trait we would refer to this condition as: 
A. Phenotype
B. Genotype
C. Homozygous
D. Gene locus
E. Heterozygous
 
6. If an organism shows a recessive phenotype, such as short pea plants, it can be: 
A. Either TT or Tt
B. Only tt
C. Either TT or tt
D. Only TT
E. Only Tt
 
7. If pairs of factors separate independently of other pairs of factors, you are dealing with the: 
A. Law of independent assortment
B. Codominance
C. Law of dominance
D. Law of segregation
E. Multiple alleles
 
8. A testcross occurs when an individual with the _____________ is crossed with an individual having the ______________. 
A. Homozygous dominant, heterozygous recessive
B. Dominant phenotype, dominant phenotype
C. Dominant phenotype, recessive phenotype
D. Heterozygous dominant, homozygous recessive
E. Homozygous recessive, homozygous recessive
 
9. If you were studying the phenomena of one gene having more than one effect, you would be studying which of the following? 
A. Gene linkage
B. Codominance
C. Incomplete dominance
D. Genotype dominance
E. Pleiotropy
 
10. In humans, brown eyes (B) are dominant over blue eyes (b). If a homozygous brown-eyed woman mates with a homozygous blue-eyed man, what would be the chances of producing a blue-eyed child? 
A. 100%
B. 50%
C. 0%
D. 25%
E. 75%
 
11. Natural selection favors those organisms that: 
A. are the biggest
B. are carnivorous
C. are the quickest to a food source
D. are able to survive and reproduce
E. have the best sense of sight and smell
 
12. ________________ results from microevolutionary changes that increase the likelihood of survival and reproduction. 
A. Adaptation
B. Macroevolutionary change
C. Inheritance of acquired traits
D. Selection
 
13. Choose the phrase that best represents microevolutionary change. 
A. darker skin after hours spent in a tanning booth
B. changes in gene frequency in a population
C. new forms of animals replacing older ones
D. major episodes of extinction
 
14. In small populations, gene frequencies can change drastically by chance alone. This phenomenon is called: 
A. migration
B. density-independent effects
C. density-dependent effects
D. genetic drift
 
15. All the members of a single species that occupy a particular area at the same time are known as a: 
A. subspecies.
B. gene pool.
C. population.
D. group.
E. sub-population.
 
16. A group of related organisms that share a distinctive form is called a 
A. genus.
B. population.
C. species.
D. family.
 
17. The result of natural selection is 
A. extinction.
B. catastrophism.
C. adaptation.
D. synthesis.
 
18. The long snout of the giant anteater, Myrmecophaga tridactyla, of South America, and the echidna, Tachyglossus aculeatus, of Australia, animals of different evolutionary lineages that are both adapted to eating ants are an example of 
A. selective breeding.
B. anatomical homology.
C. analogous traits.
D. artificial selection.
E. Both analogous traits and artificial selection are correct.
 
19. Fundamental similarity due to descent from a common ancestor is called 
A. homology.
B. analogy.
C. commonality.
D. convergence.
E. analogy and convergence are correct.
 
20. The skeletal remains of a pelvis in a whale and fingernails on the flippers of a manatee are examples of 
A. homology.
B. analogy.
C. vestigial structures.
D. artificial selection.