Variations from Mendelian Genetics

1
Variations from Mendelian Genetics

• Pages 194-196

2
Are all traits explainable by Mendels rules?
(Part 1)

• In nature, blended phenotypes are actually quite
  common
• Example Many flowers can show a color that is a
  blend of each parent

3
Genetics of flower color
4
Incomplete dominance

• Write a definition below in your own words

5
Incomplete dominance

• Is there a dominant or recessive trait?
• We use a letter for the characteristic AND the
  allele to follow these crosses
• Characteristic Flower Color (C)
• Red color allele CR
• White color allele CW

6
Incomplete dominance

• Therefore
• Red Plants are..
• White plants are.
• Pink plants are.

?
7
Incomplete dominance

• Do now
• Page 196, 3
• Continuation of the above problem
• If you crossed an oval radish with a long radish,
  what proportion of phenotypes would you see in
  the offspring?

8
Are all traits explainable by Mendels rules?
(Part 2)

• For some characteristics, organisms actually show
  both phenotypes
• Example Fur or feather colors showing spots

9
Codominance

• Write the definition in your own words
• Give an example that uses the word speckled or
  spotted

10
Codominance
Explain what is going on here. What would the F2
generation look like?