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Hmmm
• I look a lot like my
mom
...

• …define and distinguish genotype and
phenotype by giving examples of each
...
Example: Eye color– can
be brown, blue, hazel, etc
...
  It is written in the capital
form of the first letter in the
name of the dominant trait
b
...

a
...
  Example: The allele for blue
eyes is recessive (Allele=b)

Class Question
•  If not being able to roll your tongue is a recessive
trait, how would you write the allele?
•  Answer: t

Class Question
• Thick eyebrows is a dominant trait, while
thin eyebrows is a recessive trait
...

•  What letter is used for the dominant allele for
a widow’s peak?
▫  Answer: W (capital)

•  What letter is used for the recessive allele for
a straight hairline?
▫  Answer: w (lowercase)

Genotype vs
...

a
...

It describes the physical appearance
...
  Examples: Brown eyes or blue eyes

Genotype vs
...
What
PHENOTYPE goes with each genotype?

▫  TT?
▫  Tt?
▫  tt?

Class Question
• In humans, the allele for freckles (F) is
dominant to the allele for no freckles (f)
...

• If a person gets two recessive alleles, how
would you write the genotype?
▫  Answer: cc (both lowercase)

• What phenotype does a person with this
genotype have?
▫  Answer: Straight hair

Genotype or Phenotype?
Tell whether each example below is a
genotype or phenotype

• Wavy hair
▫  Phenotype

• Rr
▫  Genotype

• HH
▫  Genotype

• Light skin
▫  Phenotype
• Small ears
▫  Phenotype

• What is the trait information
located on chromosomes?

• What are traits? Give three
examples that you can think
of
...


•  Freckles is a dominant trait, while clear skin
(no freckles) is a recessive trait
...

• What type of allele is the allele
that codes for red hair?

•  Where do we get each of our
alleles from?

• Chewbaca is going to get genetic
tests to see if he get the recessive
disease his mom has
...
What genotypic
combinations could the baby
have in order to show this
phenotype?
• Brown hair is dominant to
blonde
• Brown eyes are dominant to
green eyes
...
  If freckles is a dominant trait and no
freckles is a recessive trait, what letter
would you use to write the dominant allele?
2
...
  If the allele for brown eyes (B) is dominant
to the allele for hazel eyes (b) what color
eyes does someone with the genotype Bb
have?



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