CHAPTER 12, CHROMOSOMES AND GENES QUIZ
_____1. The traits Mendel studied in garden peas showed
a) complete dominance b) incomplete
dominance c) epistasis
d) pleiotropy e) polygenic inheritance
_____2. A classical example of incomplete dominance is
a) ABO blood groups in humans
b) height of garden peas
c) pink flowers in heterozygous snapdragons
d) coat color in rabbits
e) albinism in humans and animals
_____3. A classical example of codominance is
a) ABO blood groups in humans
b) height of garden peas
c) pink flowers in heterozygous snapdragons
d) coat color in rabbits
e) albinism in humans and animals
_____4. What causes the effects of Marfan's syndrome?
a) the lack of pigment production
b) an extra 21 chromosome
c) the presence of two different codominant alleles
d) inability to produce normal connective tissue
e) the environment interacting with the genotype
_____5. A classical example of epistasis is
a) ABO blood groups in humans
b) height of garden peas
c) pink flowers in heterozygous snapdragons
d) coat color in rabbits
e) albinism in humans and animals
_____6. Marfan's disease in humans, with it numerous effects,
is an example of
a) dominance modification
b) incomplete dominance
c) epistasis
d) pleiotropy
e) polygenic inheritance
_____7. A classical example of multiple alleles is
a) coat color spotting in cattle
b) height of garden peas
c) pink flowers in heterozygous snapdragons
d) coat color in rabbits
e) albinism in humans and animals
_____8.A gene interaction in which pairs of recessive
genes at one locus prevents expression of a dominant allele at another
locus is called
a) complete dominance b) incomplete
dominance c) epistasis
d) pleiotropy e) polygenic inheritance
_____9. What causes Down syndrome?
a) the lack of pigment production
b) an extra 21 chromosome
c) the presence of two different codominant alleles
d) inability to produce normal connective tissue
e) the environment interacting with the genotype
_____10. What causes the effects of albinism?
a) the lack of pigment production
b) the environment
c) inability to produce normal connective tissue
d) the presence of two different codominant alleles
e) an extra 21 chromosome
_____11. What is the hereditary cause of type AB blood?
a) an extra 21 chromosome
b) the presence of two different codominant alleles
c) inability to produce normal connective tissue
d) the lack of pigment production
e) the environment
_____12. Skin color in humans, caused by several genes
at several loci, is an example of
a) multiple alleles at one locus
b) incomplete dominance
c) epistasis
d) pleiotropy
e) polygenic inheritance
_____13. A human male has _____ chromosomes with ____
sex chromosomes.
a) 46, XY b) 48, XY
c) 46, XX d) 48, XX
e) 46, YY
_____14. X-linkage was discovered for the first time in
a) ants
b) mice c) chickens
d) fruit flies e) humans
_____15. Which statement is Not true about X-linked characteristics?
a) More males than females are affected.
b) If a female has a characteristic, all of her sons
will show it.
c) Females can be carriers of the gene without showing
it.
d) The characteristic often skips a generation, from
a women's father to her son.
e) Males can have two copies of the allele for the trait,
but females can have only one.
_____16. Which of the terms would be equivalent to 3n
chromosomes?
a) tetraploidy b) monosomy
c) diploidy d) triploidy
e) etrasomy
_____17. Which refers to turning a chromosome segment
around 180 degrees and rejoining it to the original chromosome?
a) inversion
b) translocation c) deletion
d) duplication e) monosomy
_____18. Which refers to the loss of a complete chromosome?
a) inversion
b) translocation c) deletion
d) duplication e) monosomy
_____19. Which refers to the movement of a piece of one
chromosome to another nonhomologous chromosome?
a) inversion
b) translocation c) deletion
d) duplication e) monosomy
_____20. Which refers to the loss of a chromosome?
a) inversion
b) translocation c) deletion
d) duplication e) monosomy
_____21. Which refers to the addition of an extra segment
of a chromosome?
a) inversion
b) translocation c) deletion
d) duplication e) monosomy
_____22. In incomplete dominance, there is no
a) genetic crossing
b) homozygous phenotypes c) dominant or recessive
alleles d) intermediate traits
_____23. Type AB blood is an example of
a) codominance
b) incomplete dominance c) blending
of alleles d) monogenic traits
_____24. Humans can have blood phenotypes of A, AB, B,
or O. The four blood types result from
a) codominance
b) incomplete dominance
c) multiple alleles d)
a polygenic trait
_____25. A human with the sex genotype XX is
a) a male b)
a dwarf c) a female
d) carrying an extra chromosome
_____26. People with Down syndrome have
a) 45 chromosomes
b) 46 chromosomes c) 47
chromosomes d) no X chromosome
_____27. Trisomy is a mutation that results in a cell
having an extra
a) allele
b) codon c) chromosome
d) gene
_____28. The X and Y chromosomes are called the
a) extra chromosomes b) phenotypes
c) sex chromosomes d) autosomes
e) female chromosomes
_____29. A change in a gene due to damage or being copied
incorrectly is called
a) evolution b) meiosis
c) segregation d)
a mutation
_____30. Which of the following describes hemophilia?
a) multiple-allele trait
b) dominant trait c) sex-link
trait d) codominant trait