More Genetics Problems- Incomplete Dominance, CoDominance.
1. Snapdragons are flowers that come in both Red and White dominant colors.
When the two are crossed they are incompletely dominant which produces a
“blended” color...pink.
(a) Show a Punnett square crossing a red snapdragon with a white one.
(b) Now, cross two of the F1 offspring from the previous cross and show what the outcome is.
2. In chickens, F is the trait for frizzled feathers and S is the trait for straight feathers. Since both are dominant, when they are inherited together, the result is a “slightly frizzled” chicken.
Show Punnett squares for the following crosses:
(a) frizzled x straight feathers
(b) slightly frizzled x slightly frizzled feathers
(c) frizzled x slightly frizzled feathers
3.
Roan is a name for cattle that show a heterozygous incomplete dominant genotype. A roan calf's parents were a white cow and a red bull. What is a roan's genotype? Can two roans mate and produce all roans? Explain using a
Punnett square as proof.
4. In humans, a disease called FH is caused by an incomplete dominance situation.
If two heterozygous individuals married and planned to have children, what information would you have for them concerning the possibilities of them having normal children?