In snapdragons, both flower color (red – R- or white – r) and plant height (tall – H- or short – h) are incompletely dominant traits.
a) When a red flowering snapdragon and a white flowering snapdragon are crossed, what are the phenotypes and genotypes of the offspring?
b) When a pink flowering tall snapdragon is crossed with a red flowering short snapdragon, what are the genotypes and phenotypes of the offspring?
In chickens, feather color (black or brown) is co-dominant. Heterozygotes have feathers with both black and brown and are called speckled. Some chickens have an under-chin wattle. A smooth wattle (S) is dominant over a wrinkled wattle (s). A red wattle (R) is incompletely dominant with a white wattle (W), so an RW individual will have a pink wattle.
a) Two chickens with pink wattles are mated. What are the possible phenotypes of the offspring?
b) A chicken with a wrinkled red wattle is mated to a homozygous chicken with a smooth white wattle. What are the genotypes and phenotypes of the chicks?
c) What type of offspring are possible with two speckled chickens?
d) If you cross a speckled chicken with a red wattle and a brown chicken with a pink wattle, what are the possible genotypes and phenotypes of the offspring?
Red-green colorblindness is a recessive X-linked trait in humans. A red-green colorblind man marries a carrier female.
a) What is the genotype of the man?
b) What is the genotype of the woman?
c) Draw the Punnett square showing the possible genotypes of the children.
d) What percent of their sons will have normal vision?
e) What percent of their daughters will have normal vision?