Dominant and Recessive

    Cards (20)

    • What is a gene?
      A segment of DNA coding for a protein
    • What determines the characteristics that organisms develop?
      Inherited genes
    • What does a gene code for?
      A particular type of protein
    • What are different codes for multiple forms of the same protein called?
      Alleles
    • What is an allele?
      A different version of the same gene
    • How many copies of each gene do we have?
      Two
    • Why do we have two copies of each gene?
      One from each parent
    • What does it mean to be homozygous for an allele?
      Having two of the same allele
    • What does it mean to be heterozygous for an allele?
      Having two different alleles
    • If an organism is heterozygous and one allele is dominant, which allele gets expressed?
      The dominant allele
    • What determines a characteristic like height?
      Several different genes interacting
    • How can a recessive allele be expressed in an organism's phenotype?
      When the organism is homozygous recessive
    • When will a dominant allele be expressed?
      When heterozygous or homozygous
    • What is a genotype?
      The entire collection of alleles
    • What is a phenotype?
      The characteristics from the genotype
    • Can organisms with different genotypes have the same phenotype?
      Yes, if the dominant allele is present
    • How do genotype and phenotype differ?
      Genotype is genetic code, phenotype characteristics
    • Why does a homozygous recessive mouse have a different phenotype than a heterozygous mouse with a dominant purple allele?
      Because it has a different genotype
    • What determines traits?
      Genes
    • What trait in mites is determined by a single gene?
      Fur color
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