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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