Genetics

1
Genetics

• Notes

2
Purpose

• Distinguish between inherited traits and other
  characteristics that result from interactions
  within the environment.
• Review how make predictions about possible
  outcomes of various genetic combinations using
  Punnet Squares.

3
History of Genetics

• Gregor Mendel is considered the father of
  genetics.
• His research with pea plants paved the way for
  the foundation of modern genetics.

4
History of Genetics

• Results of Pea plant expermiment
• Watch video.

5
Where are our genes found?

• Our genes are located on chromosomes, coded in
  DNA in the nucleus of every type of cell.
• All living things contain genes in their cells.

6
Where are our genes?

• Genes are located on each chromosome.
• Genes contain the information for our inherited
  traits like skin color, eye color and hair color.
  

7
What are genotypes and phenotypes?

• Genotype is the specific code on the gene.
  Letters can be used to name the allele.
• WW homozygous dominant. Homo same
• xx homozygous recessive.
• Yy heterozygous dominant.
• Alleles are shown on the gene in
• the picture.

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What are genotypes and phenotypes?

• Phenotypes are the physical appearance traits
  that the genotype exhibits in an organism.

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How do I make a simple prediction for offspring?

• Punnet Squares will give you a statistical
  probability of the genotype the offspring will
  inherit of its parents (when 2 organisms mate).
  

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Punnet Square Examples

• Lets work these together.
• If a zork has 2 dominant alleles (BB) for brown
  skin and mates with a zirk that has two recessive
  alleles (bb) for brown skin, what would be the
  possible skin colors of their offspring?