Punnett Square Challenges!
Can you beat Mr. Forde?
• Heterozygous means mixed alleles..... like "Tt" or "Ss”
• Homozygous means same alleles.... "TT" or "ss”There are two kinds of Homozygous......
– If you have two large letters you are Homozygous Dominant "TT" etc.
– If you have two small letter alleles you are Homozygous Recessive "tt" etc.
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• Genotype means your genetic make up like TT or Tt. You are talking about the alleles or genes.
• Phenotype is the actual outcome of the gene. "Tongue roller" or "Blue Eyes". It is what you see expressed.
Let’s Review important vocabulary……
Heterozygous or Homozygous??
TtTT
bb Bb
BB tt
- Heterozygous (Hybrid)
- Heterozygous(Hybrid)
- HomozygousDominant
- HomozygousDominant
- HomozygousRecessive
- HomozygousRecessive
What are the Phenotypes?
1) Purple Flowers are DOMINANT to white
flowers.
PP- Purple
Pp-
Whitepp-
Purple
What are the Phenotypes?
2) Round Seeds are DOMINANT to wrinkled
seeds.
RR- Round
Rr-
Wrinkledrr-
Round
What are the Phenotypes?
3) Brown Eyes are DOMINANT to blue
eyes.
BB- Brown
Bb-
Bluebb-
Brown
What are the Phenotypes?
4) Bob (short) Tails are RECESSIVE to long tails.
TT- Long
Tt-
Bob (Short)tt-
Long
What are the Genotypes?
A) Straight hair is dominant to curly.
SS- Straight
Ss-
Curlyss-
Straight
What are the Genotypes?
B) Pointed heads are dominant to round
heads.
PP- Pointed
Pp-
roundpp-
Pointed
Rr x rr – Round is dominant• What percentage will be round?
R r
r
r
R
R
r
r
r
r
r
r
Rr x Rr – Round is dominant• What percentage will be round?
R r
R
r
R
R
r
r
R
r
R
r
RR x Rr – Round is dominant• What percentage will be round?
R r
R
R
R
R
r
r
R
R
R
R
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
BB-
Bb-
bb-
BLUE
BLUE
ORANGE
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
Oompah Loompah Genetics• Blue Face is dominant.
• Orange Face is recessive.
Oompah Loompah Genetics
RR-
BB-
RB-
Red
BLUE
Purple
Oompah Loompah Genetics• RED HAIR is RR.
• Blue Hair is BB.
• Purple Hair is RB
Oompah Loompah Genetics• RED HAIR is RR.
• Blue Hair is BB.
• Purple Hair is RB