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Mendelian Genetics

Quiz by Laura Sebile

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13 questions
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  • Q1
    What is the genotype of an organism that displays a dominant phenotype but is unknown whether it is homozygous or heterozygous?
    Both homozygous and heterozygous
    It is unknown
    Homozygous
    Heterozygous
    30s
  • Q2
    What principle states that the alleles for different traits are distributed to gametes independently of one another?
    The Law of Segregation
    The Law of Dominance
    The Law of Independent Assortment
    The Principle of Uniformity
    30s
  • Q3
    Which of the following best describes a phenotype?
    The genetic makeup of an organism
    The number of chromosomes in the organism
    The observable traits of an organism
    The type of alleles present
    30s
  • Q4
    If a pea plant with the genotype Tt (tall) is crossed with a plant with the genotype tt (short), what is the probability that the offspring will be tall?
    75%
    100%
    50%
    25%
    30s
  • Q5
    In a dihybrid cross, what is the expected phenotypic ratio of the offspring when two heterozygous parents are crossed (TtYy x TtYy)?
    9:3:3:1
    1:1:1:1
    1:2:1
    3:1
    30s
  • Q6
    What does it mean if an allele is described as dominant?
    It cannot be inherited
    It is always expressed
    It masks the effect of the other allele in a heterozygous condition
    It is only expressed in homozygous conditions
    30s
  • Q7
    Which of the following is a key concept of Mendel's law of segregation?
    Genes are unlinked
    Alleles separate during gamete formation
    Phenotypes blend together
    All offspring inherit two alleles from each parent
    30s
  • Q8
    What is the term for an organism's genetic makeup?
    Trait
    Phenotype
    Genotype
    Allele
    30s
  • Q9
    What does it mean if an individual is homozygous for a trait?
    They express only the dominant trait
    They have no alleles for that trait
    They have two identical alleles for that trait
    They have two different alleles for that trait
    30s
  • Q10
    Which process involves the exchange of genetic material between homologous chromosomes during meiosis?
    Segregation
    Independent assortment
    Random fertilization
    Crossing over
    30s
  • Q11
    Which term describes different forms of a gene that can exist at a specific locus?
    Phenotypes
    Alleles
    Chromosomes
    Genotypes
    30s
  • Q12
    According to Mendel's first law, what must occur for different traits to segregate independently during gamete formation?
    The traits must be linked
    The traits must be identical
    The genes must be on different chromosomes
    The alleles must be dominant
    30s
  • Q13
    What is the phenotype of an organism?
    The observable traits expressed by the organism
    The alleles it carries
    The number of chromosomes in its cells
    The genetic makeup of the organism
    30s

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