Term Review Do Not Write These Dominant Trait

Term Review. Do Not Write These!!

Dominant Trait � “Stronger” trait � Will show as long as gene is present � Represented by capital letter (B)

Recessive Trait � “Weaker” trait � Needs to have 2 to show up � Represented by lowercase letter (b)

Phenotype � What YOU look like � Example: roller, non -roller, red hair, nonred hair

Genotype � What the genes look like (letters of genes) � Example: Rr, RR, rr

Homozygous � 2 of the same alleles (genes) � Example: RR, rr

Heterozygous � 1 of the same alleles (genes) � Example: Rr

Punnett Squares! P. 13

Punnett Squares!

The item or heading at the top in the black goes on the left. Everything on the bottom goes on the right of your c-note line!

Punnett Squares! Remember! Check your page- it should be set up like this! Homozygous Dominant = TT 13

Remember! • Homozygous Dominant = TT • (Homozygous) Recessive = tt • Heterozygous= Tt

Probability � Likelihood that an event will happen � Used to predict in genetics

ALBINO ANIMALS!

• Animals with no pigment • Lack of color in eyes allows to see through to blood vessel = red

• Some “normal” animals carry the albinism gene (a) • Must have 2 recessive genes for albinism (aa)

Now it’s time for PUNNET SQUARES!

Punnett Square � Chart used to show possible gene combinations

Glue in the small piece of paper you were given in the remaining space!

Normal Squirrel Phenotype: Normal Genotype: AA or Aa x Albino Squirrel Phenotype: Albino Genotype: aa

Normal x Albino (AA x aa) a a A A Aa Aa Chances: 100% not albino 0 % albino

Normal x Albino (Aa x aa) = a a Aa aa Chances: 50% not albino 50 % albino

Normal x Normal (Aa x Aa) = A a AA Aa Aa aa Chances: 75% not albino 25% albino

Heterozygous Tongue Roller Phenotype: Roller Genotype: Tt

Homozygous Tongue Roller Phenotype: Roller Genotype: TT