Expert: Walter Hintz - 12/4/2007

Question
what is the probable genotypes of parents in the following matings:
checkered brown bird mated with a plain brown bird produced 13 checkered brown adn 15 plain brown birds.
checkered brown bird and plain red bird produced 19 checkered red birds.
checkered brown bird and plain red bird produced 9 checkered brown birds, 8 checkered red birds, 7 plain brown birds, adn 1 plain red bird.
checkered red bird and plian red bird produced 14 checkered red, 4 checkered brown, 6 plain red, and 5 plain brown birds.
plain red bird and plain red bird when mated produced 32 plain red and 12 plain brown birds.

Answer
This is complicated but this is how it appears to me following Mendelian ratios
1st cross
  Both are heterozygous checkered brown
2nd cross
  Homozygous checkered red  x homozygous checkered red

3rd cross
  Heterozygous checkered brown  x Heterzygous plain red
    This follows Mendels 9;3;3;1 ratio

4th cross
  Homozygous checkered red  x  heterozygous plain homozygous red

5th cross
 Both are heterozygous plain red

  I did not use punnet squares .  You might wish to do so to check this.