Crossing two pink snap dragon flowering plants givee 49 red 99 pink and 52 white flowering offspring. If the?

Crossing two pink snap dragon flowering plants gives 49 red, 99 pink, and 52 white flowering offspring. If the gene for red is C+ and for white C-


(A) Genotype of red


(B) Genotype of pink


(C) Genotype of white


(D) Gamete probability of pink plants


(E) Hypothesize genetic explanation

FlowersBirthday FlowersSympathy FlowersThis situation is what is called incomplete dominance. If you look at a punnet square, you get 3 dominant phenotypes to 1 recessive phenotype, but you actually get a 1:2:1 ratio of genotypes: 1homo-dominant:2:heterozygous:1 homo-recessive. The 1:2:1 ration here means the same thing is happening, only the heterozygous phenotype is different than the homozygous dominant phenotype because red gene is not completely dominant over white (producing pink).





So...genotype of red must be C+/C+.


Pink must be C+/C-9 hence why there's twice as many)


White must be C-/C-


I'm assuming by "gamete probablility" it means that there's a 50/50 chance that a pink plant will either have a red gene or a white gene.





Hope that helps!
Reply:The way to do this is with a punnet square.


If you don't know how, look here:


http://www.usoe.k12.ut.us/CURR/Science/s...





and here:


http://en.wikipedia.org/wiki/Punnett_squ...





Here is a virtual punnet square builder:


http://www.athro.com/evo/gen/punexam.htm...





Take the time to learn how to do a punnet square for yourself- they are wicked easy points on your next test...REALLY easy.acting resources