4. Considering hybridization in
a trait like the colour of the
flowers of a given plant
species (red dominant / yellow
recessive) conditioned by a
pair of different alleles, what
are the phenotypical results of
the first generation (F1) and
the phenotypical results of the
second generation (F2, formed
by crossing among F1
genotypes)? Whatare the
phenotypical proportions in F1
and F2?

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In relation to genotypes phenotypes
the hybridization comprises : parental
generation (P): RR (), yy (yellow).
F1 generation ( yy): Ry (red). F2
(Ryx Ry): RR (red),
(red), Ry (red) and (yellow).

In the F1 the proportion of
red is100%. In the F2
, the phenotypical proportion
is red (75%) to one (25%).