Chapter 6 Lesson 3-4 Vocab

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Across
  1. 5. the expression of a particular trait in an organism
  2. 6. the set of genes in an organism
  3. 9. ___________ twins who come from two different eggs fertilized by two different sperm
  4. 10. descended from ancestors with similar genetics
  5. 11. a chemical communication system, using hormones, by which messages are sent through the bloodstream
Down
  1. 1. the center of control of the endocrine system that secretes a large number of hormones
  2. 2. the basic building blocks of heredity
  3. 3. chemical substances that carry messages through the body in blood
  4. 4. __________ twins who come from one fertilized egg; twins having the same heredity.
  5. 7. descended from ancestors with dissimilar genetics
  6. 8. the genetic transmission of characteristics from parents to their offspring