Questions:
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:
- 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:
- 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:
- 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?