Summary: Test #1 Chapter 2

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  • 2 test #1

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  • the substance that genes are composed of that determines the nature of every cell in the body and how it will function

    DNA
  • all genes are composed of specific sequences of ______ that are arranged in specific locations and in a specific order along 46 chromosomes rod shaped portions of DNA that are organized in 23 pairs

    DNA
  • twins who are produced when two separate ova are fertilized by 2 separate sperm at roughly the same time

    dizygotic twins
  • genes governing traits that may take alternate forms, such as hair or eye color

    alleles
  • the one trait that is expressed when 2 competing traits are present

    dominant trait
  • the underlying combination of genetic material present in an organism

    genotype
  • an observable trait, the trail that is actually seen

    phenotype
  • inheriting from parents similar genes for a given trait

    homozygous
  • inheriting from parents different forms of a gene for a given trait

    heterozygous
  • the potential degree of variability in the actual expression of a trait due to environmental conditions

    reaction range
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