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12 questions
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  • Q1
    If several pea plants with the genotype T TYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the T TYy allele combination?
    50%
    40%
    25%
    75%
    60s
    BIOL.6f
  • Q2
    In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected?
    2 BB: 0 Bb: 2 bb
    1 BB: 2 Bb: 1 bb
    2 BB: 1 Bb: 0 bb
    0 BB: 2 Bb: 2 bb
    60s
    BIOL.6f
  • Q3
    In the 1860s Gregor Mendel performed numerous dihybrid crosses between pea plants. Dihybrid crosses involve the study of the inheritance patterns related to two different traits. In guinea pigs the allele for black fur (B) is dominant over the allele for brown fur (b), and the allele for short fur (F) is dominant over the allele for long fur (f). What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits?
    50%
    0%
    100%
    25%
    60s
    BIOL.6f
  • Q4
    Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?
    50% hairy stems: 50% hairless stems
    100% hairless stems
    75% hairy stems: 25% hairless stems
    100% hairy stems
    60s
    BIOL.6f
  • Q5
    Facial dimples and free earlobes are both considered dominant human traits. What are the expected phenotypes of the offspring of a female with dimples and free earlobes (DDFf) and a male with no dimples and attached earlobes (ddff)?
    75% with dimples and attached earlobes and 25% with no dimples and free earlobes
    75% with dimples and free earlobes and 25% with no dimples and attached earlobes
    50% with dimples and free earlobes and 50% with dimples and attached earlobes
    50% with dimples and free earlobes and 50% with no dimples and attached earlobes
    60s
    BIOL.6f
  • Q6
    Normal fruit flies have brownish-yellow bodies, and this body color is dominant. A mutation in the gene for body color can produce flies with an ebony body color. A homozygous normal fruit fly (e+e+) is crossed with a homozygous ebony fruit fly (ee). What is the predicted outcome of this genetic cross?
    All the offspring will have ebony bodies
    Of the offspring, 75% will have ebony bodies, and 25% will have brownish-yellow bodies
    All the offspring will have brownish-yellow bodies
    Of the offspring, 75% will have brownish-yellow bodies, and 25% will have ebony bodies
    60s
    BIOL.6f
  • Q7
    The four butterflies in the illustrations represent the offspring in the F1 generation. Which statement is best supported by the phenotypes of these offspring?
    Question Image
    Two of the offspring in the F1 generation will experience a spontaneous mutation
    The F1 generation is the result of a dihybrid cross
    Two of the offspring in the F1 generation will not be able to reproduce
    The F1 generation is composed only of males
    60s
    BIOL.6f
  • Q8
    Chickens can have different types of feathers. Frizzled feathers curl toward a chicken's head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?
    25%
    0%
    100%
    50%
    60s
    BIOL.6f
  • Q9
    Albinism is an autosomal recessive condition. Which circle graph shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait?
    Answer Image
    Answer Image
    Answer Image
    Answer Image
    60s
    BIOL.6f
  • Q10
    In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p). What is the expected phenotypic ratio of the offspring of a BbPp × BbPp cross if these alleles sort independently?
    9 black/polled : 3 black/horned : 3 red/polled : 1 red/horned
    12 black/polled : 0 black/horned : 0 red/polled : 4 red/horned
    16 black/polled : 0 black/horned : 0 red/polled : 0 red/horned
    4 black/polled : 4 black/horned : 4 red/polled : 4 red/horned
    60s
    BIOL.6f
  • Q11
    In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?
    A, B, or O only
    A, B, AB, or O
    O only
    A or B only
    60s
    BIOL.6f
  • Q12
    In cattle the allele for cloven hooves (H) is dominant over the allele for mule-foot hooves (h). The phenotype for each trait is shown in this picture. What is the probability of cloven hooves in the offspring of parents that are heterozygous for the trait?
    Question Image
    75%
    25%
    50%
    100%
    60s
    BIOL.6f

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