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2012-11-12 17:30:57
Vocabulary Words

Chapter 4
Show Answers:

  1. What is heredity?
    Heredity is the passing of traits from parents to offspring.
  2. What is a trait?
    A trait is a characteristic that an organism can pass on to its offspring through its genes.
  3. What is genetics?
    Genetics is the scientific study of heredity.
  4. What is fertilization?
    Fertilization is the joining of a sperm and an egg.
  5. What is a purebred?
    A purebred is the offspring of many generations that have the same trait.
  6. What is a gene?
    A gene is the set of information that controls a trait; a segment of DNA on a chromosome that codes for a specific trait.
  7. What are alleles?
    Alleles are the different forms of a gene.
  8. What is a dominant allele?
    A dominant allele is an allele whose trait always shows up in the organism when the allele is present.
  9. What is a recessive allele?
    A recessive allele is an allele that is masked when a dominant allele is present.
  10. What is a hybrid?
    A hybrid is an organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait.
  11. What is meiosis?
    Meiosis is the process that occurs in the formation of sex cells by which the number of chromosomes is reduced by half.
  12. What is a messenger RNA?
    A messenger RNA is RNA that copies the coded message from DNA in the nucleus and carries the message into the cytoplasm.
  13. What is a transfer RNA?
    Transfer RNA is the RNA in the cytoplasm that carries an amino acid to the ribosome and adds it to the growing protein chain. 
  14. What is mutation?
    Mutations is a change in a gene or chromosome.
  15. What is a Punnett
    A Punnett Square is a chart that shows all the possible combinations of alleles that can result from a genetic cross.