Quiz: Unit 3a - Patterns Of Heredity

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Quiz: Unit 3a - Patterns Of Heredity

Questions and Answers
  • 1. 
    If a pea plant were homozygous recessive for height, how would its alleles be represented?
    • A. 

      Tt

    • B. 

      TT

    • C. 

      Tt

    • D. 

      TT

  • 2. 
    Genes that are located on the sex chromosomes are called ___.
    • A. 

      Sex-linked

    • B. 

      Alleles

    • C. 

      Recessive

    • D. 

      XY

  • 3. 
    A plant that is homozygous for red flowers (rr) is crossed with a plants that is homozygous for white flowers (ww). In the case of incomplete dominance, the flowers of the offspring will be ___.
    • A. 

      Red and white

    • B. 

      White only

    • C. 

      Red only

    • D. 

      Pink only

  • 4. 
    The term for a cross that involves just one trait, such as flower color, is ___.
    • A. 

      A homozygous cross

    • B. 

      A test cross

    • C. 

      A monohybrid cross

    • D. 

      A dihybrid cross

  • 5. 
    When an organism has two alleles at a particular locus that are different, the organism is called
    • A. 

      Purebred

    • B. 

      Dominant

    • C. 

      Heterozygous

    • D. 

      Recessive

  • 6. 
    An allele is dominant in a heterozygote when it is
    • A. 

      Expressed and the other allele is not.

    • B. 

      A very common allele in the population.

    • C. 

      The weaker of the two alleles.

    • D. 

      More desirable than the other allele.

  • 7. 
    Hair color and eye color are examples of a person's
    • A. 

      Recessive traits.

    • B. 

      Dominant alleles.

    • C. 

      Genotype.

    • D. 

      Phenotype.

  • 8. 
    What do the letters inside the grid of a Punnett square represent?
    • A. 

      Phenotypes of parents

    • B. 

      Genotypes of offspring

    • C. 

      Test-crosses of offspring

    • D. 

      Chromosomes of parents

  • 9. 
    Which law states that organisms inherit two copies of each gene and donate one copy to each of their offspring?
    • A. 

      Law of genetic linkage

    • B. 

      Law of segregation

    • C. 

      Law of independent assortment

    • D. 

      Law of inheritance

  • 10. 
    Recessive alleles may not be expressed because they are
    • A. 

      Masked by the dominant allele.

    • B. 

      The least common allele in a population.

    • C. 

      The most common allele in a population.

    • D. 

      Harmful to the organism.

  • 11. 
    Mendel's second law of genetics, the law of independent assortment, is one explanation of the
    • A. 

      Random fertilization of gametes.

    • B. 

      Genetic variation within species.

    • C. 

      Greater strength of dominant alleles.

    • D. 

      Final stages of gametogenesis.

  • 12. 
    Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder?
    • A. 

      25%

    • B. 

      50%

    • C. 

      75%

    • D. 

      100%

  • 13. 
    For an XX female to express a recessive sex-linked trait, she must have
    • A. 

      A Y chromosome.

    • B. 

      An inactivated allele.

    • C. 

      Two recessive alleles.

    • D. 

      Two dominant alleles.

  • 14. 
    A child is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could the parents have?
    • A. 

      RR and RR

    • B. 

      Rr and RR

    • C. 

      Rr and rr

    • D. 

      RR and rr

  • 15. 
    What is the main reason that sex-linked disorders are most often observed in males?
    • A. 

      The X chromosome only has genes for genetic disorders.

    • B. 

      The Y chromosome cannot have genes that cause genetic disorders.

    • C. 

      The Y chromosome cannot mask alleles on the X chromosome.

    • D. 

      The X chromosome has genes only for sex determination.

  • 16. 
    Which pair of genes in Figure 6.2 would be most likely to be inherited together?
    • A. 

      A and B

    • B. 

      A and C

    • C. 

      B and C

    • D. 

      B and D

  • 17. 
    Any of the alternative forms of a gene that occurs at a specific place on a chromosome are known as ___.
    • A. 

      Alleles

    • B. 

      Genes

    • C. 

      Chromosomes

    • D. 

      Recessive traits

  • 18. 
    A chart or "family tree" that tracks which members of a family have a particular trait is called a ___.
    • A. 

      Pedigree

    • B. 

      Punnett square

    • C. 

      Genetic linkage

    • D. 

      DNA sequence

  • 19. 
    ___ studied traits of pea plants and discovered the two fundamental laws of genetics.
    • A. 

      Mendel

    • B. 

      Watson and Crick

    • C. 

      Mack

    • D. 

      Einstein

  • 20. 
    ___ is a pattern of inheritance in which one allele is not completely dominant over the other, thereby creating a blended phenotype.
    • A. 

      Incomplete dominance

    • B. 

      Co-dominance

    • C. 

      Multiple allele

    • D. 

      Sex-linked