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Ch.11 Genetics

Quiz by Kate Downey

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45 questions
Show answers
  • Q1
    Mendel believed that the characteristics of pea plants are determined by the:
    inheritance of units or factors from one parent
    relative health of the parent plants at the time of pollination
    inheritance of units or factors from both parents
    30s
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  • Q2
    An allele is:
    one of several possible forms of a gene
    another word for a gene
    a homozygous genotype
    a heterozygous genotype
    30s
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  • Q3
    Phenotype refers to the ______________________ of an individual.
    genetic makeup
    recessive alleles
    dominant alleles
    actual physical appearance
    30s
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  • Q4
    When the genotype consists of a dominant and a recessive allele, the phenotype will be like _________________ allele.
    both
    the dominant
    neither
    the recessive
    30s
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  • Q5
    Assuming that both parent plants in the diagram below are homozygous, why would all of the f1 generation have yellow phenotypes?
    Question Image
    because both parents passed on yellow alleles
    because the f1 genotypes are homozygous
    because both parents passed on green alleles
    because yellow is dominant over green
    30s
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  • Q6
    The idea that different pairs of alleles are passed to offspring independently is Mendel's principle of:
    unit inheritance
    law of segregation
    law of independent assortment
    law of dominance
    30s
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  • Q7
    In the diagram below, what accounts for the green pea seed in the f2 generation?
    Question Image
    The f1 generation parents are homozygous yellow.
    On average, 1 out of 4 offspring of heterozygous parents will be homozygous recessive.
    The f1 generation parents are homozygous green.
    The yellow allele is dominant over the green one.
    30s
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  • Q8
    The idea that for any particular trait, the pair of alleles of each parent separate and only one allele from each parent passes to an offspring is Mendel's principle of:
    law of independent assortment
    law of segregation
    law of dominance
    hybridization
    30s
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  • Q9
    Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that
    many of the observable characters that vary in pea plants are controlled by single genes.
    peas show easily observed variations in a number of characters, such as pea shape and flower color
    peas have an unusually long reproduction time
    it is possible to completely control matings between different pea plants.
    30s
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  • Q10
    A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
    a dihybrid cross.
    the blending model of genetics.
    true-breeding
    dominance
    30s
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  • Q11
    What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
    Genes are composed of DNA
    Traits are inherited in discrete units, and are not the results of "blending.
    An organism that is homozygous for many recessive traits is at a disadvantage.
    There is considerable genetic variation in garden peas
    30s
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  • Q12
    Which of the following is (are) true for alleles?
    They can represent alternative forms of a gene
    They can be identical(AA) or different(Aa) for any given gene in a somatic cell.
    All of the following are true for alleles.
    They can be dominant or recessive.
    30s
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  • Q13
    Two plants are crossed, resulting in offspring with a 3:1 phenotype ratio for a particular trait. This suggests
    That the parents were both heterozygous.
    That the parents were true-breeding for contrasting traits.
    That each offspring has the same alleles.
    That a blending of traits has occurred
    30s
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  • Q14
    A 9:3:3:1 phenotypic ratio is characteristic of which of the following?
    dihybrid cross
    monohybrid cross
    linked genes
    trihybrid cross
    30s
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  • Q15
    When crossing a homozygous recessive with a heterozygous organism, what is the chance of getting an offspring with the homozygous recessive phenotype?
    75%
    25%
    50%
    0%
    30s
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  • Q16
    In a particular plant, leaf color is controlled by gene D. Plants with the dominant allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of this cross is diagrammed in the Punnett square shown below, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square. Which of the boxes marked 1-4 correspond to plants with dark leaves?
    Question Image
    2 and 3
    1 and 2
    1,2 and 3
    1,2,3,4
    120s
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  • Q17
    Which of the boxes correspond to plants with a heterozygous genotype?
    Question Image
    2 and 4
    1 and 4
    2 and 3
    1 and 3
    120s
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  • Q18
    PP,Pp= purple, pp= white. The offspring of a cross between two heterozygous purple-flowering plants (Pp×Pp) results in
    all purple-flowered plants.
    two types of white-flowered plants: PP and Pp.
    all white-flowered plants
    3 purple-flowered plants and 1 white-flowered plants
    120s
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  • Q19
    What are Punnett squares used for?
    predicting the result of genetic crosses between organisms of known genotypes
    determining the DNA sequence of a given gene
    identifying the gene locus where allelic variations are possible
    testing for the presence of the recessive allele
    120s
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  • Q20
    Which of the following is false, regarding the law of segregation?
    It can account for the 3:1 ratio seen in the F2 generation of Mendel's crosses.
    It is a method that can be used to determine the number of chromosomes in a plant.
    It can be explained by the segregation of homologous chromosomes during meiosis
    It states that each of two alleles for a given trait segregate into different gametes.
    120s
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