Download Exam 5 Review - Iowa State University

Leader: Julie
Course: Bio 211 (2)
Instructor: Dr. Biederman
Supplemental Instruction
Date:
Iowa State University
1. A cross between a homozygous purple flowered and a homozygous white flowered pea plants
results in offspring with purple flowers. This demonstrates
A) blending inheritance
B) true breeding traits
C) dominance of one trait over another
D) a di-hybrid cross
E) a mistake by Mendel
Exam 5 Review:
Chap 16, 23, 24, 25
2. When you cross an organism that is homozygous recessive for a trait with one that is a
heterozygote for the same trait, what is the chance of producing homozygous recessive
offspring?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
3. The rare llama-rabbit is known to have 2 traits: head shape (H) and tail length (T) that are
controlled by un-linked genes. The genotype of a stud-male llama-rabbit is HhTt. Which of the
following is a possible genotype found in his gametes?
A) HT
B) Hh
C) HhTt
D) Tt
E) H
4. In llama-rabbits, big heads (H) are dominant to little heads (h) and long tails (T) are dominant
to short (t). If you cross the male above with a HHtt female what proportion of offspring will
have big heads and short tails?
A) 25%.
B) 50%
C) 75%
D) 100%
E) 0%.
5. What proportion of offspring will have little heads?
A) 10%
B) 100%
C) 50%
D) 20%
E) 0%
6. An organisms appearance or observable traits are referred to as its
A) genotype
B) phenotype
C) character
1060 Hixson-Lied Student Success Center  515-294-6624  [email protected]  http://www.si.iastate.edu
D) trait
E) dominant allele
7. Red-green color blindness in humans is a sex-linked recessive trait. A husband and a wife with
normal vision have a color-blind son. What are the genotypes of the parents?
A)Xc Xc and XcY
B) Xc Xc and XCY
C) XC XCand XcY
D) XC XC and XCY
E) XC Xc and XCY
8. Mendel’s law of segregations refers to
A) mitosis
B) alleles segregating during gamete production
C) the independent orientation of homologous chromosome pairs relative to each other
D) fertilization of the egg by an independent sperm
9. Mendel’ slaw of independent assortment refers to
A) mitosis
B) alleles segregating during gamete production
C) the independent orientation of homologous chromosome pairs relative to each other
D) fertilization of the egg by an independent sperm
10. Charles Darwin was the first person to propose
A) that organisms evolve
B) that the earth is older than a few thousand years
C) a mechanism for how organisms evolve
D) a mechanism for how organisms evolve that was supported by evidence
E) a way to use artificial selection to domesticate plants and animals
11. Natural selection operates at the level of the _____________ whereas evolution occurs at the
level of the ______________.
A) population, individual
B) gene, population
C) individual, population
D) individual, gene
12. A population is in Hardy-Weinberg equilibrium There are two alleles A and a. The
frequency of allele a is 0.2 What is the frequency of the A allele?
A) 0.2
B) 0.4
C) 0.1
D) 0.8
13. In the Hardy-Weinberg equation, 2pq refers to the frequency
A) of individual that are homozygous for one of the alleles
B) of individual that are heterozygous
C) of all the alleles in the population
D) of all the genotypes in the population
14. Which of the following might be occurring if a population is not in Hardy-Weinberg
equilibrium?
A) natural selection
B) random matng
C) no migration
D) no gene flow
15. If the allele frequencies in a population are A: 0.6 and a: 0.4. what is the frequency of the Aa
genotype if the population is in Hardy-Weinberg equilibrium?
A) 1.0
B) 0.52
C) 0.36
D) 0.48
16. Using the same data what is the frequency of the AA genotype?
A) 1.0
B) 0.52
C) 0.36
D) 0.48
17. Individuals from two lizards species can mate but the offspring are sterile. This is an
example of a
A) pre-zygotic reproductive barrier
B) anatomical incompatibility
C) geographic isolation
D) post-zygotic reproductive barrier
E) behavioral isolation
18. Two alleles that both affect the phenotype in separate distinguishable ways is known as?
A) Complete dominance
B) Codominance
C) incomplete dominance
D) Partial dominance
19. This occurs when a few individuals become isolated from a larger population establishing a
new population whose gene pool differs from the original population.
A) Bottleneck effect
B) Founder effect
C) Julie effect
D) Translocation
20. Genes for each character exist in two variant forms called _____________.
A) Alleles
B) Chromosomes
C) Spots
D) Genotype
21. Genetic drift has a major impact on ______________.
A) Small populations
B) Large populations
22. A testcross can determine the ___________ of an organism that has a __________ phenotype
A) Phenotype, recessive
B) Genotype, dominant
C) Phenotype, dominant
D) Genotype, recessive
23. The normal character phenotype is referred to as what?
A) Dominant type
B) Recessive type
C) Wild type
D) Normal type
24. Fathers pass sex-linked alleles to all of their __________, but to none of their __________
A) Sons, daughters
B) Daughters, sons
25. This mechanism prevents the interspecies hybrid zygote from developing into a viable, fertile
offspring.
A) Prezygotic isolation
B) Postzygotic isolation
26. What is the smallest unit that can evolve?
A) individual
B) population
C) species
27. The Hardy-Weinberg equation is represented by:
A) q^3+2pq+q^3=1
B) p^2+pq^2+q^2=1
C) q^2+2pq+q^2=1
D) p^2+2pq+q^2=1
28. Migration tends to _________ difference in allele frequency between population while
___________ genetic diversity within a population
A) decrease, increase
B) increase, decrease
29. The phenotype of F1 hybrids is somewhere between the phenotype of the two parental
varieties is called?
A) complete dominance
B) codominance
C) incomplete dominance
D) partial dominance
30. All of the alleles for every gene in a given population is called a ___________?
A) species
B) gene pool
C) locus
D) hybrid zone
31. Which person viewed life as descent with modification
A) Charles Darwin
B) Carolus Linnaeus
C) George Cuvier
D) Alfred Wallace
32. Which refers to when organelles such as chloroplasts are contributed by only the egg
A) Extranuclear inheritance
B) Organelle inheritance
C) Maternal effect
D) Maternal inheritance
33. A plant that has the genotype AaBbcc ________
A) is triploid
B) is homozygous at two loci
C) is heterozygous at two loci
D) has dominant alleles at three loci
34. The precise location of a gene on a chromosome is known as its ______
A) loci
B) trait
C) sequence
D) character
35. A sudden change in the environment that drastically reduces the size of the population
describes
A) Hybrid zone
B) Founder effect
C) Bottleneck effect
D) Dispersion
36. Which of the following is NOT a prezygotic isolating mechanism
A) Behavioral
B) temporal
C) mechanical
D) congregational
E) all of the above are prezygotic isolating mechanisms
37. Which of the following is NOT a postzygotic isolating mechanism
A) Breakdown
B) Reduced fertility/viability
C) hybrid sterility
D) all of the above are postzygotic isolating mechanisms
38. Describe Allele frequency
39. Describe Genotype frequency
40. The Hardy-Weinburg equation describes a population that is not ________________.