Question 1:

Snapdragons are incompletely dominant for color; they have phenotypes red, pink, or white.  The red flowers     are homozygous dominant, the white flowers are homozygous recessive, and the        pink flowers are heterozygous.           Give the genotypes for each of the phenotypes, using the letters        “R” and “ r ” for alleles:

  1. Red snapdragon                  b.  Pink snapdragon                c.  White snapdragon

genotype: ______                    genotype: ______                    genotype: ______


Show genetic crosses between the following snapdragon parents, using the punnett squares provided, and record the genotypic and phenotypic %s below:

  1. a. pink x pink       Genotypic % ______________ Phenotypic % _______________

    b.  red x white     Genotypic % ______________ Phenotypic % _______________

    c.  pink x white     Genotypic % ______________ Phenotypic % _______________




Question 2:  In horses, some of the genes for hair color are incompletely dominant.  Genotypes are as follows:  brown horses         are BB, white horses are bb and a Bb genotype creates a yellow-tannish colored horse with a white mane and tail, which is called “palomino”.  Show the genetic crosses between the following horses and record the genotypic and phenotypic percentages:

  1. brown x white                    Genotypic % ______________           Phenotypic % ______________

    b.  brown x palomino              Genotypic % ______________           Phenotypic % ______________

    c.  palomino x palomino             Genotypic % ______________           Phenotypic % ______________




Can palominos be considered a purebred line of horses?  Why or why not?