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    An allele that has no noticeable effect on the appearance of an organism unless it is found in the homozygous condition is

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    1. With incomplete inheritance
    a. Traits show either dominance or recessiveness
    b. Heterozygotes are phenotypic intermediates
    c. Phenotypic traits have a continuous nature
    d. Genetic counseling is useful

    2. An allele that has no noticeable effect on the appearance of an organism unless it is
    found in the homozygous condition is
    a. dominant
    b. codominant
    c. X-linked
    d. recessive
    e. heterozygous

    3) TRUE/FALSE

    ____ Sexual reproduction provides less variation among individuals in a population than
    does asexual reproduction.
    ____ Most human genetic disorders arise from the inheritance of dominant alleles.
    ____ In recessive disorders, mutant alleles are able to persist in the population among
    carrier.
    ____ Mendel's parental crosses were examples of cross-fertilization, while the F1
    crosses were examples of self-fertilization.
    ____ In cancer, the cell cycle and mitosis become deregulated.

    4. When and how does "disjunction happen" what is the outcome? Provide a specific example.

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    Solution Preview

    1. With incomplete inheritance
    b. Heterozygotes are phenotypic intermediates
    (This is sometimes called a blending of phenotypes, i.e. red and white giving pink would be incomplete inheritance.)

    2. An allele that has no noticeable effect on the appearance of an organism unless it is
    found in the homozygous condition is
    d. recessive
    (This is its classic definition. You won't notice recessive alleles unless the organism is homozygous for both recessive alleles.)

    3) TRUE/FALSE

    Sexual reproduction provides less variation among individuals in a population than does asexual reproduction. (This ...

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