2. Eye Color Hair Color Nose Shape Skin Type

3. fGenes fGenes control the traits that show up in an organism. Down syndrome karyotype courtesy of: http://www.bis.med.jhmi.edu/Dan/DOE/fig6.html

4. DNA (deoxyribonucleic acid) is the genetic material of living organisms and is located in the chromosomes of each cell.

5.  Alleles are the genetic make-up (genotype) of traits. An allele is a component of a gene. Genes can have or more alleles.  For example:  B is the allele for brown eyes.  b is the allele for blue eyes.

6. T is the dominant allele for a tall parent t is the recessive allele for a short parent

7.  Dominant genes cover up the recessive genes whenever present.  The genes that seem to disappear are called recessive.

8. Eye color: dark is dominant Look for dimples: presence of dimple is dominant Earlobes: unattached is dominant Ability to roll tongue into a u-shape is dominant Hairline: Widows peak

9. Eye color: blue is recessive Look for dimples: absence is recessive Earlobes: attached is recessive Inability to roll tongue is recessive Straight hairline is recessive

10. Comprehension Questions  What do people inherit?  What are genes made of?  How is a gene represented?  Name the two types of alleles.  How are dominant and recessive genes represented?  Give an example of a dominant and a recessive gene?

11. http://encarta.msn.com/find/Concise.asp ?z=1&pg=2&ti=761552130http://encarta.msn.com/find/Concise.asp ?z=1&pg=2&ti=761552130 http://encarta.msn.com/find/MediaMax.a sp?pg=3&ti=761564762&idx=46157015 4http://encarta.msn.com/find/MediaMax.a sp?pg=3&ti=761564762&idx=46157015 4 http://home.naxs.com/bechafin/genetics.htm http://gslc.genetics.utah.edu/basic/conc epts/inheritance.htmlhttp://gslc.genetics.utah.edu/basic/conc epts/inheritance.html