Notesale: Turn your study into money

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Hmm…
•  Does the dominant trait always cover up the
recessive?

Objectives
• IWBAT explain the meaning of incomplete
dominance and co-dominance
• IWBAT predict genotypic and phenotypic
ratios of a cross involving incompletely
dominant and co-dominant traits

Anemia

Modes of Inheritance
•  Some traits have forms that are not
completely dominant or recessive and are
inherited differently
•  Genes do not always interact in the same way

Co-Dominance
• Co-dominance: both alleles are expressed
in the heterozygous genotype à

phenotype expresses both traits
• Since both alleles are dominant, typically
written one letter with exponents
...
When a black
rabbit and white rabbit are
crossed, a gray rabbit is
produced
...
Use a Punnett
square to answer the
questions below
...
  What fraction of
offspring is
expected to be gray?
2
...
  What is the percent
probability of
producing a white
rabbit?

Board Practice: Co-dominance
•  In chickens, feather color can
be co-dominant
...
When a white
chicken and a red chicken are
mated, a chicken with both
white and red feathers is
produced
...


•  Draw the Punnett
square
•  What fraction of
offspring is expected
to have both white
and red feathers?
•  What is the percent
probability of
producing a chicken
with only white
feathers?

Instructions – Voice level 0
•  Put your heading on your paper
•  Answer questions 1-5 for Incomplete vs Codominance Practice
•  EDIT for #3: SpongeBob and his pal Patrick love to
go jellyfishing at Jellyfish Fields! The fields are
home to a special type of BLUE AND YELLOW
jellyfish known as goobers and only really great
jellyfishermen are lucky enough to catch some on
every trip

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