Genetics, Natural selection and Evolution

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Across
  1. 2. Section of the long strand of DNA found in a chromosome, which contains instructions for a characteristic.
  2. 5. Type of twins that are from different eggs and sperm.
  3. 7. Both alleles are the same (both dominant OR both recessive)
  4. 9. features that an organism has to enable it to do a certain job or survive in a particular place.
  5. 11. Person who proposed the theory of natural selection.
  6. 14. A square diagram where alleles for both parents are mapped to show the possible alleles for the offspring.
  7. 15. A change in one or more characteristics of a population over a long period of time.
  8. 16. The trait that is expressed (ex: Ear lobe)
  9. 18. Base pairs in DNA: ___ (adenine)pairs with ____ and ____ (cytosine) pairs with ____.
  10. 19. Type of twins which will have the same mix of genes.
  11. 20. Notation showing both alleles present for a gene/trait. (ex. Tt)
Down
  1. 1. Alleles are a mix of dominant and recessive (ex Tt)
  2. 3. Double helix molecule made of 4 base pairs.
  3. 4. An organism that no longer exists.
  4. 6. An allele that will always be expressed (shown) when present.
  5. 8. _________selection: A process in which an organism is more likely to survive and reproduce than other members of the species because it possesses a certain inherited genetic variation.
  6. 10. Molecule that does most of the actions of the cell.
  7. 12. An allele that will only be expressed (shown) when no dominant allele is present.
  8. 13. one version of a pair of genes that occupy a specific location on a particular chromosome and control the same trait.
  9. 17. Similar to an unzipped strand of DNA. Copies, carries and transcribes the code for a protien.