What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the
flowers in the F, generation are tall and yellow?

If the trait for tall and trait for yellow are recessive: ttyy and ttyy

If the trait for tall is dominant and trait for yellow is recessive: TTyy and TTyy, Ttyy and TTyy

If the trait for tall is recessive and trait for yellow is dominant: ttYY and ttYY, or TtYy and TTYY

If the trait for tall is dominant and trait for yellow is dominant TTYY and TTYY, or TtYy and TTYY

What should be the genotypes of the parent flowers (P generation) if he wants to ensure that all of the  flowers in the F, generation are tall and yellow?

YYTT x YyTt= YYTT, YyTt, YYTT and YyTt

The genotype of the parent flowers is YY and Yy in order to produce all generation that are tall and yellow

Explanation:

cytokinin is what stimulates cell division

in tropical forests it typically is hot with a lot of rain. when what is hot, it starts to evaporate and turn into water vapor.