The horticulturalist crosses two geraniums from the f1 generation. look at the punnett square to see this cross. what ratio of red- to white-flowering plants would you expect to see in the phenotypes of the f2 generation?

Hi,

In Geranium plants  red flowers is given by the allele R that is dominant (so RR or Rr ) genotype will produce red flowers.

If we talk about the attached punnet square which i took from the exercise book, you can see that there was a cross made between two plants with heterozygous genotype for red flowers.

P1:                                             Rr X Rr

Gametes:                                R:  r : R : r

F1:                                            RR: Rr: Rr: rr

so there is 3: 1 in F1 offspring for red to white flowers.

Now the question is about  f2 generation, when we cross F1 generation suppose we do a cross of Rr and rr from F1 generations let us see what happens.

F1:                                          Rr:         rr

Gametes:                             R: r:     r: R

F2 :                                     Rr : rr: Rr: rr

Rr: Red flowers

rr: White flowers:

So the ratio in F2 generation will be 2 red : 2 white. Please see attached punnet squares (first one for question) and the second one of F1 cross for better understanding.

Hope it help!

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: